Add BloomScreenshotDelegate

This prompts the user to select an area.
It will be implemented in a follow-up CL.

Bug: b/165356952
Tests: manually deployed
Change-Id: I33c1cc49c4cea542b87256cb00ac3370ef8a4427
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376026
Auto-Submit: Jeroen Dhollander <jeroendh@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Jeroen Dhollander <jeroendh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806674}

chrome/browser/ui/ash/assistant/assistant_client_impl.cc

@@ -21,6 +21,7 @@
 #include "chrome/browser/ui/ash/assistant/device_actions_delegate_impl.h"
 #include "chromeos/components/bloom/public/cpp/bloom_controller.h"
 #include "chromeos/components/bloom/public/cpp/bloom_controller_factory.h"
+#include "chromeos/components/bloom/public/cpp/bloom_screenshot_delegate.h"
 #include "chromeos/constants/chromeos_features.h"
 #include "chromeos/constants/chromeos_switches.h"
 #include "chromeos/services/assistant/public/cpp/features.h"
@@ -92,7 +93,9 @@ void AssistantClientImpl::MaybeInit(Profile* profile) {
   if (chromeos::assistant::features::IsBloomEnabled()) {
     bloom_controller_ = chromeos::bloom::BloomControllerFactory::Create(
         profile->GetURLLoaderFactory(),
-        IdentityManagerFactory::GetForProfile(profile));
+        IdentityManagerFactory::GetForProfile(profile),
+        nullptr  // TODO(jeroendh): pass in real BloomScreenshotDelegate
+    );
   }
 }
 

chromeos/components/bloom/BUILD.gn

@@ -14,7 +14,6 @@ source_set("bloom") {
     "bloom_server_proxy.h",
     "bloom_server_proxy_impl.cc",
     "bloom_server_proxy_impl.h",
-    "screenshot_grabber.h",
   ]
 
   deps = [
@@ -25,6 +24,7 @@ source_set("bloom") {
     "//chromeos/services/assistant/public/shared",
     "//components/signin/public/identity_manager",
     "//services/network/public/cpp",
+    "//ui/gfx",
   ]
 }
 
@@ -44,5 +44,7 @@ source_set("unit_tests") {
     "//services/network/public/cpp",
     "//testing/gmock",
     "//testing/gtest",
+    "//ui/gfx",
+    "//ui/gfx:test_support",
   ]
 }

chromeos/components/bloom/DEPS

@@ -2,4 +2,5 @@ include_rules = [
   "+ash/public",
   "+components/signin/public/identity_manager",
   "+services/network/public",
+  "+ui/gfx",
 ]

chromeos/components/bloom/bloom_controller_impl.cc

@@ -7,20 +7,20 @@
 #include "base/logging.h"
 #include "chromeos/components/bloom/bloom_interaction.h"
 #include "chromeos/components/bloom/bloom_server_proxy.h"
-#include "chromeos/components/bloom/screenshot_grabber.h"
+#include "chromeos/components/bloom/public/cpp/bloom_screenshot_delegate.h"
 
 namespace chromeos {
 namespace bloom {
 
 BloomControllerImpl::BloomControllerImpl(
     signin::IdentityManager* identity_manager,
-    std::unique_ptr<ScreenshotGrabber> screenshot_grabber,
+    std::unique_ptr<BloomScreenshotDelegate> screenshot_delegate,
     std::unique_ptr<BloomServerProxy> server_proxy)
     : identity_manager_(identity_manager),
-      screenshot_grabber_(std::move(screenshot_grabber)),
+      screenshot_delegate_(std::move(screenshot_delegate)),
       server_proxy_(std::move(server_proxy)) {
   DCHECK(identity_manager_);
-  DCHECK(screenshot_grabber_);
+  DCHECK(screenshot_delegate_);
   DCHECK(server_proxy_);
 }
 
@@ -76,10 +76,10 @@ void BloomControllerImpl::AddObserver(
   owned_interaction_observers_.push_back(std::move(observer));
 }
 
-void BloomControllerImpl::SetScreenshotGrabberForTesting(
-    std::unique_ptr<ScreenshotGrabber> screenshot_grabber) {
-  DCHECK(screenshot_grabber);
-  screenshot_grabber_ = std::move(screenshot_grabber);
+void BloomControllerImpl::SetScreenshotDelegateForTesting(
+    std::unique_ptr<BloomScreenshotDelegate> screenshot_delegate) {
+  DCHECK(screenshot_delegate);
+  screenshot_delegate_ = std::move(screenshot_delegate);
 }
 
 }  // namespace bloom

chromeos/components/bloom/bloom_controller_impl.h

@@ -20,13 +20,14 @@ namespace chromeos {
 namespace bloom {
 
 class BloomInteraction;
+class BloomScreenshotDelegate;
 class BloomServerProxy;
-class ScreenshotGrabber;
 
 class BloomControllerImpl : public BloomController {
  public:
-  BloomControllerImpl(signin::IdentityManager* identity_manager,
-                      std::unique_ptr<ScreenshotGrabber> screenshot_grabber,
+  BloomControllerImpl(
+      signin::IdentityManager* identity_manager,
+      std::unique_ptr<BloomScreenshotDelegate> screenshot_delegate,
       std::unique_ptr<BloomServerProxy> server_proxy);
   BloomControllerImpl(const BloomControllerImpl&) = delete;
   BloomControllerImpl& operator=(const BloomControllerImpl&) = delete;
@@ -43,15 +44,18 @@ class BloomControllerImpl : public BloomController {
   void ShowUI();
   void ShowResult(const std::string& result);
 
-  ScreenshotGrabber* screenshot_grabber() { return screenshot_grabber_.get(); }
+  BloomScreenshotDelegate* screenshot_delegate() {
+    return screenshot_delegate_.get();
+  }
   BloomServerProxy* server_proxy() { return server_proxy_.get(); }
   signin::IdentityManager* identity_manager() { return identity_manager_; }
 
-  void SetScreenshotGrabberForTesting(std::unique_ptr<ScreenshotGrabber>);
+  void SetScreenshotDelegateForTesting(
+      std::unique_ptr<BloomScreenshotDelegate>);
 
  private:
   signin::IdentityManager* const identity_manager_;
-  std::unique_ptr<ScreenshotGrabber> screenshot_grabber_;
+  std::unique_ptr<BloomScreenshotDelegate> screenshot_delegate_;
   std::unique_ptr<BloomServerProxy> server_proxy_;
 
   base::ObserverList<BloomInteractionObserver> interaction_observers_;

chromeos/components/bloom/bloom_controller_impl_unittest.cc

@@ -7,13 +7,15 @@
 #include "chromeos/components/bloom/bloom_interaction_observer.h"
 #include "chromeos/components/bloom/bloom_server_proxy.h"
 #include "chromeos/components/bloom/public/cpp/bloom_interaction_resolution.h"
-#include "chromeos/components/bloom/screenshot_grabber.h"
+#include "chromeos/components/bloom/public/cpp/bloom_screenshot_delegate.h"
 #include "chromeos/services/assistant/public/shared/constants.h"
 #include "components/signin/public/identity_manager/identity_manager.h"
 #include "components/signin/public/identity_manager/identity_test_environment.h"
 #include "components/signin/public/identity_manager/scope_set.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/image/image.h"
+#include "ui/gfx/image/image_unittest_util.h"
 
 namespace chromeos {
 namespace bloom {
@@ -28,22 +30,22 @@ const char kEmail[] = "test@gmail.com";
 
 #define EXPECT_NO_CALLS(args...) EXPECT_CALL(args).Times(0)
 
-class ScreenshotGrabberMock : public ScreenshotGrabber {
+class ScreenshotDelegateMock : public BloomScreenshotDelegate {
  public:
-  ScreenshotGrabberMock() {
+  ScreenshotDelegateMock() {
     ON_CALL(*this, TakeScreenshot).WillByDefault([this](Callback callback) {
       // Store the callback passed to TakeScreenshot() so we can invoke it
       // later from our tests.
       this->callback_ = std::move(callback);
     });
   }
-  ~ScreenshotGrabberMock() override = default;
+  ~ScreenshotDelegateMock() override = default;
 
   MOCK_METHOD(void, TakeScreenshot, (Callback callback));
 
   // Sends the given screenshot to the callback passed to TakeScreenshot()
   void SendScreenshot(
-      const base::Optional<Screenshot>& screenshot = Screenshot()) {
+      const base::Optional<gfx::Image>& screenshot = gfx::Image()) {
     EXPECT_TRUE(callback_) << "TakeScreenshot() was never called.";
 
     if (callback_)
@@ -104,7 +106,7 @@ class BloomServerProxyMock : public BloomServerProxy {
   BloomServerProxyMock() {
     ON_CALL(*this, AnalyzeProblem)
         .WillByDefault([this](const std::string& access_token,
-                              const Screenshot screenshot, Callback callback) {
+                              const gfx::Image& screenshot, Callback callback) {
           // Store the callback passed to AnalyzeProblem() so we can invoke it
           // later from our tests.
           this->callback_ = std::move(callback);
@@ -113,7 +115,7 @@ class BloomServerProxyMock : public BloomServerProxy {
   MOCK_METHOD(void,
               AnalyzeProblem,
               (const std::string& access_token,
-               const Screenshot screenshot,
+               const gfx::Image& screenshot,
                Callback callback));
 
   void SendResponse(base::Optional<std::string> html = std::string("<html/>")) {
@@ -156,10 +158,10 @@ class BloomControllerImplTest : public testing::Test {
  protected:
   void StartInteractionAndSendAccessTokenAndScreenshot(
       std::string access_token = "<access-token>",
-      Screenshot screenshot = Screenshot()) {
+      gfx::Image screenshot = gfx::Image()) {
     controller().StartInteraction();
     IssueAccessToken(access_token);
-    screenshot_grabber_mock().SendScreenshot(screenshot);
+    screenshot_delegate_mock().SendScreenshot(screenshot);
   }
 
   // Returns the |ScopeSet| that was passed to the access token request.
@@ -178,9 +180,9 @@ class BloomControllerImplTest : public testing::Test {
 
   BloomControllerImpl& controller() { return controller_; }
 
-  ScreenshotGrabberMock& screenshot_grabber_mock() {
-    return *static_cast<ScreenshotGrabberMock*>(
-        controller_.screenshot_grabber());
+  ScreenshotDelegateMock& screenshot_delegate_mock() {
+    return *static_cast<ScreenshotDelegateMock*>(
+        controller_.screenshot_delegate());
   }
 
   BloomInteractionObserverMock* AddInteractionObserverMock() {
@@ -217,7 +219,7 @@ class BloomControllerImplTest : public testing::Test {
 
   BloomControllerImpl controller_{
       identity_test_env_.identity_manager(),
-      std::make_unique<NiceMock<ScreenshotGrabberMock>>(),
+      std::make_unique<NiceMock<ScreenshotDelegateMock>>(),
       std::make_unique<NiceMock<BloomServerProxyMock>>()};
 };
 
@@ -236,7 +238,7 @@ TEST_F(BloomControllerImplTest, ShouldFetchAccessToken) {
 }
 
 TEST_F(BloomControllerImplTest, ShouldTakeScreenshot) {
-  EXPECT_CALL(screenshot_grabber_mock(), TakeScreenshot);
+  EXPECT_CALL(screenshot_delegate_mock(), TakeScreenshot);
 
   controller().StartInteraction();
 }
@@ -245,7 +247,7 @@ TEST_F(BloomControllerImplTest, ShouldAbortWhenFetchingAccessTokenFails) {
   auto* interaction_tracker = AddInteractionTracker();
 
   controller().StartInteraction();
-  screenshot_grabber_mock().SendScreenshot();
+  screenshot_delegate_mock().SendScreenshot();
 
   FailAccessToken();
 
@@ -260,7 +262,7 @@ TEST_F(BloomControllerImplTest, ShouldAbortWhenFetchingScreenshotFails) {
   controller().StartInteraction();
   IssueAccessToken();
 
-  screenshot_grabber_mock().SendScreenshotFailed();
+  screenshot_delegate_mock().SendScreenshotFailed();
 
   EXPECT_FALSE(interaction_tracker->HasInteraction());
   EXPECT_EQ(BloomInteractionResolution::kNoScreenshot,
@@ -270,7 +272,7 @@ TEST_F(BloomControllerImplTest, ShouldAbortWhenFetchingScreenshotFails) {
 TEST_F(BloomControllerImplTest,
        ShouldPassAccessTokenAndScreenshotToBloomServer) {
   const std::string& access_token = "<the-access-token>";
-  const Screenshot screenshot{1, 2, 3, 4, 5};
+  const gfx::Image screenshot = gfx::test::CreateImage(10, 20);
 
   EXPECT_CALL(bloom_server(), AnalyzeProblem(access_token, screenshot, _));
 
@@ -312,7 +314,7 @@ TEST_F(BloomInteractionObserverTest,
 
   controller().StartInteraction();
   IssueAccessToken();
-  screenshot_grabber_mock().SendScreenshot();
+  screenshot_delegate_mock().SendScreenshot();
 }
 
 TEST_F(BloomInteractionObserverTest,
@@ -322,7 +324,7 @@ TEST_F(BloomInteractionObserverTest,
   EXPECT_NO_CALLS(*observer, OnShowUI);
 
   controller().StartInteraction();
-  screenshot_grabber_mock().SendScreenshot();
+  screenshot_delegate_mock().SendScreenshot();
 }
 
 TEST_F(BloomInteractionObserverTest,

chromeos/components/bloom/bloom_interaction.cc

@@ -9,12 +9,13 @@
 #include "chromeos/components/bloom/bloom_controller_impl.h"
 #include "chromeos/components/bloom/bloom_interaction.h"
 #include "chromeos/components/bloom/bloom_server_proxy.h"
+#include "chromeos/components/bloom/public/cpp/bloom_screenshot_delegate.h"
 #include "chromeos/components/bloom/public/cpp/future_value.h"
-#include "chromeos/components/bloom/screenshot_grabber.h"
 #include "chromeos/services/assistant/public/shared/constants.h"
 #include "components/signin/public/identity_manager/access_token_info.h"
 #include "components/signin/public/identity_manager/primary_account_access_token_fetcher.h"
 #include "components/signin/public/identity_manager/scope_set.h"
+#include "ui/gfx/image/image.h"
 
 namespace chromeos {
 namespace bloom {
@@ -33,8 +34,10 @@ void BloomInteraction::Start() {
 }
 
 void BloomInteraction::StartAssistantInteraction(std::string&& access_token,
-                                                 Screenshot&& screenshot) {
+                                                 gfx::Image&& screenshot) {
+  DVLOG(2) << "Opening assistant UI";
   controller_->ShowUI();
+  DVLOG(2) << "Contacting Bloom server";
   controller_->server_proxy()->AnalyzeProblem(
       access_token, screenshot, Bind(&BloomInteraction::OnServerResponse));
 }
@@ -45,10 +48,13 @@ void BloomInteraction::OnServerResponse(base::Optional<std::string> html) {
     return;
   }
 
+  DVLOG(2) << "Got server response";
   controller_->ShowResult(html.value());
 }
 
 void BloomInteraction::FetchAccessTokenAsync() {
+  DVLOG(2) << "Fetching access token";
+
   signin::ScopeSet scopes;
   scopes.insert(assistant::kBloomScope);
 
@@ -64,7 +70,7 @@ void BloomInteraction::FetchAccessTokenAsync() {
 }
 
 void BloomInteraction::FetchScreenshotAsync() {
-  controller_->screenshot_grabber()->TakeScreenshot(
+  controller_->screenshot_delegate()->TakeScreenshot(
       Bind(&BloomInteraction::OnScreenshotReady));
   screenshot_future_ = std::make_unique<ScreenshotFuture>();
 }
@@ -73,20 +79,24 @@ void BloomInteraction::OnAccessTokenRequestCompleted(
     GoogleServiceAuthError error,
     signin::AccessTokenInfo access_token_info) {
   if (error.state() != GoogleServiceAuthError::NONE) {
+    LOG(WARNING) << "Failed to fetch the access token";
     controller_->StopInteraction(BloomInteractionResolution::kNoAccessToken);
     return;
   }
 
+  DVLOG(2) << "Received access token";
   access_token_future_->SetValue(std::move(access_token_info.token));
 }
 
 void BloomInteraction::OnScreenshotReady(
-    base::Optional<Screenshot> screenshot) {
+    base::Optional<gfx::Image> screenshot) {
   if (!screenshot) {
+    LOG(WARNING) << "Failed to take the screenshot";
     controller_->StopInteraction(BloomInteractionResolution::kNoScreenshot);
     return;
   }
 
+  DVLOG(2) << "Received screenshot";
   screenshot_future_->SetValue(std::move(screenshot.value()));
 }
 

chromeos/components/bloom/bloom_interaction.h

@@ -9,10 +9,13 @@
 #include "base/bind.h"
 #include "base/callback_forward.h"
 #include "base/optional.h"
-#include "chromeos/components/bloom/screenshot_grabber.h"
 
 class GoogleServiceAuthError;
 
+namespace gfx {
+class Image;
+}
+
 namespace signin {
 struct AccessTokenInfo;
 class PrimaryAccountAccessTokenFetcher;
@@ -26,7 +29,7 @@ class BloomControllerImpl;
 template <typename _Type>
 class FutureValue;
 using AccessTokenFuture = FutureValue<std::string>;
-using ScreenshotFuture = FutureValue<Screenshot>;
+using ScreenshotFuture = FutureValue<gfx::Image>;
 
 // A single Bloom interaction. This will:
 //    * Fetch the access token and screenshot.
@@ -34,7 +37,7 @@ using ScreenshotFuture = FutureValue<Screenshot>;
 //    * Fetch the Bloom response and forward it to the Assistant interaction.
 class BloomInteraction {
   using StartCallback = base::OnceCallback<void(const std::string& access_token,
-                                                Screenshot&& screenshot)>;
+                                                gfx::Image&& screenshot)>;
 
  public:
   explicit BloomInteraction(BloomControllerImpl* controller);
@@ -47,7 +50,7 @@ class BloomInteraction {
 
  private:
   void StartAssistantInteraction(std::string&& access_token,
-                                 Screenshot&& screenshot);
+                                 gfx::Image&& screenshot);
 
   void OnServerResponse(base::Optional<std::string> html);
 
@@ -56,7 +59,7 @@ class BloomInteraction {
 
   void OnAccessTokenRequestCompleted(GoogleServiceAuthError error,
                                      signin::AccessTokenInfo access_token_info);
-  void OnScreenshotReady(base::Optional<Screenshot> screenshot);
+  void OnScreenshotReady(base::Optional<gfx::Image> screenshot);
 
   template <typename _Method, typename... Args>
   auto Bind(_Method method, Args&&... args) {

chromeos/components/bloom/bloom_server_proxy.h

@@ -7,7 +7,10 @@
 
 #include <string>
 #include "base/callback.h"
-#include "chromeos/components/bloom/screenshot_grabber.h"
+
+namespace gfx {
+class Image;
+}
 
 namespace chromeos {
 namespace bloom {
@@ -26,7 +29,7 @@ class BloomServerProxy {
   // Send the screenshot to the Bloom server for analysis, and send the response
   // to |callback|.
   virtual void AnalyzeProblem(const std::string& access_token,
-                              const Screenshot screenshot,
+                              const gfx::Image& screenshot,
                               Callback callback) = 0;
 };
 

chromeos/components/bloom/bloom_server_proxy_impl.cc

@@ -11,7 +11,7 @@ BloomServerProxyImpl::BloomServerProxyImpl() = default;
 BloomServerProxyImpl::~BloomServerProxyImpl() = default;
 
 void BloomServerProxyImpl::AnalyzeProblem(const std::string& access_token,
-                                          const Screenshot screenshot,
+                                          const gfx::Image& screenshot,
                                           Callback callback) {
   // TODO(jeroendh): implement
 }

chromeos/components/bloom/bloom_server_proxy_impl.h

@@ -16,7 +16,7 @@ class BloomServerProxyImpl : public BloomServerProxy {
   ~BloomServerProxyImpl() override;
 
   void AnalyzeProblem(const std::string& access_token,
-                      const Screenshot screenshot,
+                      const gfx::Image& screenshot,
                       Callback callback) override;
 };
 

chromeos/components/bloom/public/cpp/BUILD.gn

@@ -10,6 +10,7 @@ component("cpp") {
     "bloom_controller.h",
     "bloom_interaction_resolution.cc",
     "bloom_interaction_resolution.h",
+    "bloom_screenshot_delegate.h",
   ]
 
   deps = [ "//base" ]
@@ -27,6 +28,7 @@ component("bloom_controller_factory") {
   ]
 
   deps = [
+    ":cpp",
     "//base",
     "//chromeos/components/bloom",
   ]

chromeos/components/bloom/public/cpp/bloom_controller_factory.cc

@@ -10,27 +10,18 @@
 #include "chromeos/components/bloom/bloom_controller_impl.h"
 #include "chromeos/components/bloom/bloom_interaction_observer_impl.h"
 #include "chromeos/components/bloom/bloom_server_proxy_impl.h"
-#include "chromeos/components/bloom/screenshot_grabber.h"
+#include "chromeos/components/bloom/public/cpp/bloom_screenshot_delegate.h"
 
 namespace chromeos {
 namespace bloom {
 
-namespace {
-
-// TODO(jeroendh): Replace with actual working screenshot grabber.
-class FakeScreenshotGrabber : public ScreenshotGrabber {
- public:
-  void TakeScreenshot(Callback callback) override { NOTIMPLEMENTED(); }
-};
-
-}  // namespace
-
 // static
 std::unique_ptr<BloomController> BloomControllerFactory::Create(
     scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
-    signin::IdentityManager* identity_manager) {
+    signin::IdentityManager* identity_manager,
+    std::unique_ptr<BloomScreenshotDelegate> screenshot_delegate) {
   auto result = std::make_unique<BloomControllerImpl>(
-      identity_manager, std::make_unique<FakeScreenshotGrabber>(),
+      identity_manager, std::move(screenshot_delegate),
       std::make_unique<BloomServerProxyImpl>());
 
   result->AddObserver(std::make_unique<BloomInteractionObserverImpl>());

chromeos/components/bloom/public/cpp/bloom_controller_factory.h

@@ -22,13 +22,15 @@ namespace chromeos {
 namespace bloom {
 
 class BloomController;
+class BloomScreenshotDelegate;
 
 class COMPONENT_EXPORT(BLOOM) BloomControllerFactory {
  public:
   // Create the Bloom controller. Can only be invoked once.
   static std::unique_ptr<BloomController> Create(
       scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
-      signin::IdentityManager* identity_manager);
+      signin::IdentityManager* identity_manager,
+      std::unique_ptr<BloomScreenshotDelegate> screenshot_delegate);
 };
 
 }  // namespace bloom

chromeos/components/bloom/screenshot_grabber.h → chromeos/components/bloom/public/cpp/bloom_screenshot_delegate.h

@@ -2,31 +2,31 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROMEOS_COMPONENTS_BLOOM_SCREENSHOT_GRABBER_H_
-#define CHROMEOS_COMPONENTS_BLOOM_SCREENSHOT_GRABBER_H_
+#ifndef CHROMEOS_COMPONENTS_BLOOM_PUBLIC_CPP_BLOOM_SCREENSHOT_DELEGATE_H_
+#define CHROMEOS_COMPONENTS_BLOOM_PUBLIC_CPP_BLOOM_SCREENSHOT_DELEGATE_H_
 
-#include <vector>
 #include "base/callback_forward.h"
 #include "base/optional.h"
 
+namespace gfx {
+class Image;
+}
+
 namespace chromeos {
 namespace bloom {
 
-using Screenshot = std::vector<uint8_t>;
-
-// Interface to grab a screenshot.
-class ScreenshotGrabber {
+// Prompts the user to select a part of the screen, and invokes the callback
+// with a screenshot of the selected area.
+class BloomScreenshotDelegate {
  public:
-  using Callback =
-      base::OnceCallback<void(base::Optional<Screenshot> screenshot)>;
-  virtual ~ScreenshotGrabber() = default;
+  using Callback = base::OnceCallback<void(base::Optional<gfx::Image>)>;
+
+  virtual ~BloomScreenshotDelegate() = default;
 
-  // Asynchronously takes a screenshot, and passes it to the callback.
-  // If this fails or is aborted, will pass |base::nullopt| to the callback.
-  virtual void TakeScreenshot(Callback callback) = 0;
+  virtual void TakeScreenshot(Callback ready_callback) = 0;
 };
 
 }  // namespace bloom
 }  // namespace chromeos
 
-#endif  // CHROMEOS_COMPONENTS_BLOOM_SCREENSHOT_GRABBER_H_
+#endif  // CHROMEOS_COMPONENTS_BLOOM_PUBLIC_CPP_BLOOM_SCREENSHOT_DELEGATE_H_