Implement sink list button for Harmony Cast dialog

- Add CastDialogSinkButton, which will be used for sink list items in
  the Harmony Cast dialog. It's a subclass of HoverButton that shows a
  device icon and an optional status indicator (checkmark or throbber).
- Add UIMediaSink, a struct containing data used to populate the button
- Add Skia icons used by the button: Cast for EDU, input, speaker,
  speaker group, and TV

Screenshot of the button (two of them) in a WIP dialog:
https://drive.google.com/file/d/1M1R9jO-VHEO18aA3pTpoQBI4FHMU5MEf/view?usp=sharing

Dimensions and colors are subject to change in later CLs.

Bug: 826089, 826393
Change-Id: I0eef58e1c0b9bf2cff3b3d146e911d3a18c7d23c
Reviewed-on: https://chromium-review.googlesource.com/996458
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Adam Parker <amp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550722}

chrome/app/vector_icons/BUILD.gn

@@ -35,6 +35,7 @@ aggregate_vector_icons("chrome_vector_icons") {
     "browser_tools_error_touch.icon",
     "browser_tools_touch.icon",
     "browser_tools_update_touch.icon",
+    "cast_for_education.icon",
     "content_paste.icon",
     "cookie.icon",
     "crashed_tab.icon",
@@ -54,6 +55,7 @@ aggregate_vector_icons("chrome_vector_icons") {
     "google_pay_logo_with_vertical_separator.icon",
     "horizontal_menu.icon",
     "incognito.icon",
+    "input.icon",
     "key.icon",
     "laptop.icon",
     "launch.icon",
@@ -80,6 +82,8 @@ aggregate_vector_icons("chrome_vector_icons") {
     "settings.icon",
     "signin_button_drop_down_arrow.icon",
     "smartphone.icon",
+    "speaker.icon",
+    "speaker_group.icon",
     "supervisor_account.icon",
     "supervisor_account_circle.icon",
     "sync.icon",
@@ -107,6 +111,7 @@ aggregate_vector_icons("chrome_vector_icons") {
     "tablet.icon",
     "translate.icon",
     "trash_can.icon",
+    "tv.icon",
     "usb_security_key.icon",
     "user_account_avatar.icon",
     "user_menu_guest.icon",

chrome/app/vector_icons/cast_for_education.icon

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+MOVE_TO, 42, 6,
+H_LINE_TO, 6,
+R_CUBIC_TO, -2.2f, 0, -4, 1.8f, -4, 4,
+R_V_LINE_TO, 6,
+R_H_LINE_TO, 4,
+R_V_LINE_TO, -6,
+R_H_LINE_TO, 36,
+R_V_LINE_TO, 28,
+H_LINE_TO, 28,
+R_V_LINE_TO, 4,
+R_H_LINE_TO, 14,
+R_CUBIC_TO, 2.2f, 0, 4, -1.8f, 4, -4,
+V_LINE_TO, 10,
+R_CUBIC_TO, 0, -2.2f, -1.8f, -4, -4, -4,
+CLOSE,
+MOVE_TO, 2, 36,
+R_V_LINE_TO, 6,
+R_H_LINE_TO, 6,
+R_CUBIC_TO, 0, -3.32f, -2.68f, -6, -6, -6,
+CLOSE,
+R_MOVE_TO, 0, -8,
+R_V_LINE_TO, 4,
+R_CUBIC_TO, 5.52f, 0, 10, 4.48f, 10, 10,
+R_H_LINE_TO, 4,
+R_CUBIC_TO, 0, -7.74f, -6.26f, -14, -14, -14,
+CLOSE,
+R_MOVE_TO, 0, -8,
+R_V_LINE_TO, 4,
+R_CUBIC_TO, 9.94f, 0, 18, 8.06f, 18, 18,
+R_H_LINE_TO, 4,
+R_CUBIC_TO, 0, -12.16f, -9.86f, -22, -22, -22,
+CLOSE,
+R_MOVE_TO, 20, 2.18f,
+R_V_LINE_TO, 4,
+LINE_TO, 29, 30,
+R_LINE_TO, 7, -3.82f,
+R_V_LINE_TO, -4,
+LINE_TO, 29, 26,
+R_LINE_TO, -7, -3.82f,
+CLOSE,
+MOVE_TO, 29, 12,
+R_LINE_TO, -11, 6,
+R_LINE_TO, 11, 6,
+R_LINE_TO, 11, -6,
+R_LINE_TO, -11, -6,
+CLOSE
\ No newline at end of file

chrome/app/vector_icons/input.icon

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+CANVAS_DIMENSIONS, 24,
+MOVE_TO, 21, 3.01f,
+H_LINE_TO, 3,
+R_CUBIC_TO, -1.1f, 0, -2, 0.9f, -2, 2,
+V_LINE_TO, 9,
+R_H_LINE_TO, 2,
+V_LINE_TO, 4.99f,
+R_H_LINE_TO, 18,
+R_V_LINE_TO, 14.03f,
+H_LINE_TO, 3,
+V_LINE_TO, 15,
+H_LINE_TO, 1,
+R_V_LINE_TO, 4.01f,
+R_CUBIC_TO, 0, 1.1f, 0.9f, 1.98f, 2, 1.98f,
+R_H_LINE_TO, 18,
+R_CUBIC_TO, 1.1f, 0, 2, -0.88f, 2, -1.98f,
+R_V_LINE_TO, -14,
+R_ARC_TO, 2, 2, 0, 0, 0, -2, -2,
+CLOSE,
+MOVE_TO, 11, 16,
+R_LINE_TO, 4, -4,
+R_LINE_TO, -4, -4,
+R_V_LINE_TO, 3,
+H_LINE_TO, 1,
+R_V_LINE_TO, 2,
+R_H_LINE_TO, 10,
+R_V_LINE_TO, 3,
+CLOSE

chrome/app/vector_icons/speaker.icon

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+CANVAS_DIMENSIONS, 24,
+MOVE_TO, 17, 2,
+H_LINE_TO, 7,
+R_CUBIC_TO, -1.1f, 0, -2, 0.9f, -2, 2,
+R_V_LINE_TO, 16,
+R_CUBIC_TO, 0, 1.1f, 0.9f, 1.99f, 2, 1.99f,
+LINE_TO, 17, 22,
+R_CUBIC_TO, 1.1f, 0, 2, -0.9f, 2, -2,
+V_LINE_TO, 4,
+R_CUBIC_TO, 0, -1.1f, -0.9f, -2, -2, -2,
+CLOSE,
+R_MOVE_TO, -5, 2,
+R_CUBIC_TO, 1.1f, 0, 2, 0.9f, 2, 2,
+R_CUBIC_TO, 0, 1.1f, -0.9f, 2, -2, 2,
+R_ARC_TO, 2, 2, 0, 1, 1, 0, -4,
+CLOSE,
+R_MOVE_TO, 0, 16,
+R_CUBIC_TO, -2.76f, 0, -5, -2.24f, -5, -5,
+R_CUBIC_TO, 0, -2.76f, 2.24f, -5, 5, -5,
+R_CUBIC_TO, 2.76f, 0, 5, 2.24f, 5, 5,
+R_CUBIC_TO, 0, 2.76f, -2.24f, 5, -5, 5,
+CLOSE,
+R_MOVE_TO, 0, -8,
+R_CUBIC_TO, -1.66f, 0, -3, 1.34f, -3, 3,
+R_CUBIC_TO, 0, 1.66f, 1.34f, 3, 3, 3,
+R_CUBIC_TO, 1.66f, 0, 3, -1.34f, 3, -3,
+R_CUBIC_TO, 0, -1.66f, -1.34f, -3, -3, -3,
+CLOSE

chrome/app/vector_icons/speaker_group.icon

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+CANVAS_DIMENSIONS, 24,
+MOVE_TO, 18.2f, 1,
+H_LINE_TO, 9.8f,
+CUBIC_TO, 8.81f, 1, 8, 1.81f, 8, 2.8f,
+R_V_LINE_TO, 14.4f,
+R_CUBIC_TO, 0, 0.99f, 0.81f, 1.79f, 1.8f, 1.79f,
+R_LINE_TO, 8.4f, 0.01f,
+R_CUBIC_TO, 0.99f, 0, 1.8f, -0.81f, 1.8f, -1.8f,
+V_LINE_TO, 2.8f,
+R_CUBIC_TO, 0, -0.99f, -0.81f, -1.8f, -1.8f, -1.8f,
+CLOSE,
+MOVE_TO, 14, 3,
+R_CUBIC_TO, 1.1f, 0, 2, 0.89f, 2, 2,
+R_CUBIC_TO, 0, 1.11f, -0.9f, 2, -2, 2,
+R_CUBIC_TO, -1.1f, 0, -2, -0.89f, -2, -2,
+R_CUBIC_TO, 0, -1.11f, 0.9f, -2, 2, -2,
+CLOSE,
+R_MOVE_TO, 0, 13.5f,
+R_CUBIC_TO, -2.21f, 0, -4, -1.79f, -4, -4,
+R_CUBIC_TO, 0, -2.21f, 1.79f, -4, 4, -4,
+R_CUBIC_TO, 2.21f, 0, 4, 1.79f, 4, 4,
+R_CUBIC_TO, 0, 2.21f, -1.79f, 4, -4, 4,
+CLOSE,
+CIRCLE, 14, 12.5, 2.5,
+MOVE_TO, 6, 5,
+H_LINE_TO, 4,
+R_V_LINE_TO, 16,
+R_ARC_TO, 2, 2, 0, 0, 0, 2, 2,
+R_H_LINE_TO, 10,
+R_V_LINE_TO, -2,
+H_LINE_TO, 6,
+V_LINE_TO, 5,
+CLOSE

chrome/app/vector_icons/tv.icon

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+CANVAS_DIMENSIONS, 24,
+MOVE_TO, 21, 3,
+H_LINE_TO, 3,
+R_CUBIC_TO, -1.1f, 0, -2, 0.9f, -2, 2,
+R_V_LINE_TO, 12,
+R_CUBIC_TO, 0, 1.1f, 0.9f, 2, 2, 2,
+R_H_LINE_TO, 5,
+R_V_LINE_TO, 2,
+R_H_LINE_TO, 8,
+R_V_LINE_TO, -2,
+R_H_LINE_TO, 5,
+R_CUBIC_TO, 1.1f, 0, 1.99f, -0.9f, 1.99f, -2,
+LINE_TO, 23, 5,
+R_CUBIC_TO, 0, -1.1f, -0.9f, -2, -2, -2,
+CLOSE,
+R_MOVE_TO, 0, 14,
+H_LINE_TO, 3,
+V_LINE_TO, 5,
+R_H_LINE_TO, 18,
+R_V_LINE_TO, 12,
+CLOSE

chrome/browser/ui/BUILD.gn

@@ -1404,6 +1404,8 @@ split_static_library("ui") {
       "media_router/presentation_receiver_window_factory_mac.cc",
       "media_router/query_result_manager.cc",
       "media_router/query_result_manager.h",
+      "media_router/ui_media_sink.cc",
+      "media_router/ui_media_sink.h",
       "native_window_tracker.h",
       "omnibox/alternate_nav_infobar_delegate.cc",
       "omnibox/alternate_nav_infobar_delegate.h",
@@ -3177,6 +3179,8 @@ split_static_library("ui") {
         "views/location_bar/star_view.h",
         "views/location_bar/zoom_view.cc",
         "views/location_bar/zoom_view.h",
+        "views/media_router/cast_dialog_sink_button.cc",
+        "views/media_router/cast_dialog_sink_button.h",
         "views/media_router/media_router_dialog_controller_views.cc",
         "views/media_router/media_router_dialog_controller_views.h",
         "views/media_router/presentation_receiver_window_factory.cc",
@@ -3395,6 +3399,10 @@ split_static_library("ui") {
         ]
       }
     }
+
+    if (is_chrome_branded) {
+      deps += [ "//chrome/browser/ui/media_router/internal/vector_icons" ]
+    }
   }
 
   if (use_aura) {

chrome/browser/ui/media_router/ui_media_sink.cc

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/media_router/ui_media_sink.h"
+
+namespace media_router {
+
+UIMediaSink::UIMediaSink() = default;
+
+UIMediaSink::UIMediaSink(const UIMediaSink& other) = default;
+
+UIMediaSink::~UIMediaSink() = default;
+
+}  // namespace media_router

chrome/browser/ui/media_router/ui_media_sink.h

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_MEDIA_ROUTER_UI_MEDIA_SINK_H_
+#define CHROME_BROWSER_UI_MEDIA_ROUTER_UI_MEDIA_SINK_H_
+
+#include "base/strings/string16.h"
+#include "chrome/common/media_router/media_sink.h"
+#include "url/gurl.h"
+
+namespace media_router {
+
+enum class UIMediaSinkState {
+  // Sink is available to be Cast to.
+  AVAILABLE,
+  // Sink is starting a new Casting activity. A sink temporarily enters this
+  // state when transitioning from AVAILABLE to CONNECTED (or to ERROR_STATE).
+  CONNECTING,
+  // Sink has a media route.
+  CONNECTED,
+  // Sink is disconnected/cached (not available right now).
+  UNAVAILABLE,
+  // Sink is in an error state.
+  ERROR_STATE
+};
+
+// A bitmask of this enum is used to indicate what actions can be performed on a
+// sink.
+enum class UICastAction {
+  // Start Casting the presentation for the current tab or the tab itself.
+  CAST_TAB = 1 << 1,
+  // Start Casting the entire desktop.
+  CAST_DESKTOP = 1 << 2,
+  // Stop Casting.
+  STOP = 1 << 3,
+};
+
+struct UIMediaSink {
+ public:
+  UIMediaSink();
+  UIMediaSink(const UIMediaSink& other);
+  ~UIMediaSink();
+
+  // The unique ID for the media sink.
+  std::string id;
+
+  // Name that can be used by the user to identify the sink.
+  base::string16 friendly_name;
+
+  // Normally the sink status text is set from |state|. This field allows it
+  // to be overridden for error states or to show route descriptions.
+  base::string16 status_text;
+
+  // Presentation URL to use when initiating a new casting activity for this
+  // sink. For sites that integrate with the Presentation API, this is the
+  // top frame presentation URL. Mirroring, Cast apps, and DIAL apps use a
+  // non-https scheme.
+  GURL presentation_url;
+
+  // Active route ID, or empty string if none.
+  std::string route_id;
+
+  // The ID of the tab associated with the media route specified by |route_id|.
+  // This is a nullopt if the route is not associated with a tab (e.g. because
+  // it is for desktop Casting) or there is no route.
+  base::Optional<int> tab_id;
+
+  // The icon to use for the sink.
+  SinkIconType icon_type;
+
+  // The current state of the media sink.
+  UIMediaSinkState state;
+
+  // If non-zero, a help center article ID for troubleshooting.
+  // This will show an info bubble with a tooltip for the article.
+  // Otherwise, 0.
+  int tooltip_article_id;
+
+  // Bitmask of UICastAction values that determine which actions are supported
+  // by this sink.
+  int allowed_actions;
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_UI_MEDIA_ROUTER_UI_MEDIA_SINK_H_

chrome/browser/ui/views/media_router/cast_dialog_sink_button.cc

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/views/media_router/cast_dialog_sink_button.h"
+
+#include "chrome/app/vector_icons/vector_icons.h"
+#include "chrome/grit/generated_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/ui_base_types.h"
+#include "ui/gfx/color_palette.h"
+#include "ui/gfx/paint_vector_icon.h"
+#include "ui/views/controls/throbber.h"
+#include "ui/views/vector_icons.h"
+
+#if defined(GOOGLE_CHROME_BUILD)
+#include "chrome/browser/ui/media_router/internal/vector_icons/vector_icons.h"
+#endif
+
+namespace media_router {
+
+namespace {
+
+gfx::ImageSkia CreateSinkIcon(SinkIconType icon_type) {
+  const gfx::VectorIcon* vector_icon;
+  switch (icon_type) {
+    case SinkIconType::CAST_AUDIO_GROUP:
+      vector_icon = &kSpeakerGroupIcon;
+      break;
+    case SinkIconType::CAST_AUDIO:
+      vector_icon = &kSpeakerIcon;
+      break;
+    case SinkIconType::EDUCATION:
+      vector_icon = &kCastForEducationIcon;
+      break;
+    case SinkIconType::WIRED_DISPLAY:
+      vector_icon = &kInputIcon;
+      break;
+// Use proprietary icons only in Chrome builds. The default TV icon is used
+// instead for these sink types in Chromium builds.
+#if defined(GOOGLE_CHROME_BUILD)
+    case SinkIconType::MEETING:
+      vector_icon = &vector_icons::kMeetIcon;
+      break;
+    case SinkIconType::HANGOUT:
+      vector_icon = &vector_icons::kHangoutIcon;
+      break;
+#endif  // defined(GOOGLE_CHROME_BUILD)
+    case SinkIconType::CAST:
+    case SinkIconType::GENERIC:
+    default:
+      vector_icon = &kTvIcon;
+      break;
+  }
+  constexpr int kPrimaryIconSize = 24;
+  return gfx::CreateVectorIcon(*vector_icon, kPrimaryIconSize,
+                               gfx::kChromeIconGrey);
+}
+
+std::unique_ptr<views::View> CreatePrimaryIconForSink(const UIMediaSink& sink) {
+  auto icon_view = std::make_unique<views::ImageView>();
+  icon_view->SetImage(CreateSinkIcon(sink.icon_type));
+  return icon_view;
+}
+
+std::unique_ptr<views::View> CreateSecondaryIconForSink(
+    const UIMediaSink& sink) {
+  if (sink.state == UIMediaSinkState::CONNECTED) {
+    constexpr int kSecondaryIconSize = 16;
+    auto icon_view = std::make_unique<views::ImageView>();
+    icon_view->SetImage(gfx::CreateVectorIcon(
+        views::kMenuCheckIcon, kSecondaryIconSize, gfx::kChromeIconGrey));
+    return icon_view;
+  } else if (sink.state == UIMediaSinkState::CONNECTING) {
+    auto throbber_view = std::make_unique<views::Throbber>();
+    throbber_view->Start();
+    return throbber_view;
+  }
+  return nullptr;
+}
+
+}  // namespace
+
+CastDialogSinkButton::CastDialogSinkButton(
+    views::ButtonListener* button_listener,
+    const UIMediaSink& sink)
+    : HoverButton(button_listener,
+                  CreatePrimaryIconForSink(sink),
+                  sink.friendly_name,
+                  sink.status_text,
+                  CreateSecondaryIconForSink(sink)),
+      sink_(sink) {}
+
+CastDialogSinkButton::~CastDialogSinkButton() {}
+
+void CastDialogSinkButton::SetSelected(bool is_selected) {
+  is_selected_ = is_selected;
+  if (!is_selected_) {
+    GetInkDrop()->SnapToHidden();
+    GetInkDrop()->SetHovered(false);
+  }
+}
+
+bool CastDialogSinkButton::OnMousePressed(const ui::MouseEvent& event) {
+  // TODO(crbug.com/826089): Show a context menu on right click.
+  if (event.IsRightMouseButton())
+    return true;
+  return HoverButton::OnMousePressed(event);
+}
+
+void CastDialogSinkButton::OnBlur() {
+  Button::OnBlur();
+  if (is_selected_)
+    SnapInkDropToActivated();
+}
+
+base::string16 CastDialogSinkButton::GetActionText() const {
+  return l10n_util::GetStringUTF16(sink_.state == UIMediaSinkState::CONNECTED
+                                       ? IDS_MEDIA_ROUTER_STOP_CASTING_BUTTON
+                                       : IDS_MEDIA_ROUTER_START_CASTING_BUTTON);
+}
+
+void CastDialogSinkButton::SnapInkDropToActivated() {
+  GetInkDrop()->SnapToActivated();
+}
+
+}  // namespace media_router

chrome/browser/ui/views/media_router/cast_dialog_sink_button.h

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_VIEWS_MEDIA_ROUTER_CAST_DIALOG_SINK_BUTTON_H_
+#define CHROME_BROWSER_UI_VIEWS_MEDIA_ROUTER_CAST_DIALOG_SINK_BUTTON_H_
+
+#include "chrome/browser/ui/media_router/ui_media_sink.h"
+#include "chrome/browser/ui/views/hover_button.h"
+
+namespace ui {
+class MouseEvent;
+}
+
+namespace media_router {
+
+// A button representing a sink in the Cast dialog. It is highlighted when
+// hovered or selected.
+class CastDialogSinkButton : public HoverButton {
+ public:
+  CastDialogSinkButton(views::ButtonListener* button_listener,
+                       const UIMediaSink& sink);
+  ~CastDialogSinkButton() override;
+
+  // Sets |is_selected_| and updates the button's ink drop accordingly.
+  void SetSelected(bool is_selected);
+
+  // views::View:
+  bool OnMousePressed(const ui::MouseEvent& event) override;
+  void OnBlur() override;
+
+  // Returns the text that should be shown on the main action button of the Cast
+  // dialog when this button is selected.
+  base::string16 GetActionText() const;
+
+  // Changes the ink drop to the pressed state without animation.
+  void SnapInkDropToActivated();
+
+  const UIMediaSink& sink() const { return sink_; }
+
+ private:
+  UIMediaSink sink_;
+
+  bool is_selected_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(CastDialogSinkButton);
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_UI_VIEWS_MEDIA_ROUTER_CAST_DIALOG_SINK_BUTTON_H_

chrome/browser/ui/views/media_router/cast_dialog_sink_button_unittest.cc

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/views/media_router/cast_dialog_sink_button.h"
+
+#include "chrome/browser/ui/media_router/ui_media_sink.h"
+#include "chrome/browser/ui/views/harmony/chrome_layout_provider.h"
+#include "chrome/grit/generated_resources.h"
+#include "chrome/test/views/chrome_views_test_base.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/views/controls/button/button.h"
+
+namespace media_router {
+
+namespace {
+
+class MockButtonListener : public views::ButtonListener {
+ public:
+  MockButtonListener() = default;
+  ~MockButtonListener() = default;
+
+  MOCK_METHOD2(ButtonPressed,
+               void(views::Button* sender, const ui::Event& event));
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockButtonListener);
+};
+
+class CastDialogSinkButtonTest : public ChromeViewsTestBase {
+ public:
+  CastDialogSinkButtonTest() = default;
+  ~CastDialogSinkButtonTest() override = default;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CastDialogSinkButtonTest);
+};
+
+void CheckActionTextForState(UIMediaSinkState state,
+                             base::string16 expected_text) {
+  UIMediaSink sink;
+  sink.state = state;
+  CastDialogSinkButton button(nullptr, sink);
+  EXPECT_EQ(expected_text, button.GetActionText());
+}
+
+}  // namespace
+
+TEST_F(CastDialogSinkButtonTest, GetActionText) {
+  // TODO(crbug.com/826089): Determine what the text should be for other states.
+  CheckActionTextForState(
+      UIMediaSinkState::AVAILABLE,
+      l10n_util::GetStringUTF16(IDS_MEDIA_ROUTER_START_CASTING_BUTTON));
+  CheckActionTextForState(
+      UIMediaSinkState::CONNECTED,
+      l10n_util::GetStringUTF16(IDS_MEDIA_ROUTER_STOP_CASTING_BUTTON));
+}
+
+}  // namespace media_router

chrome/test/BUILD.gn

@@ -4226,6 +4226,7 @@ test("unit_tests") {
       "../browser/ui/views/global_error_bubble_view_unittest.cc",
       "../browser/ui/views/harmony/layout_provider_unittest.cc",
       "../browser/ui/views/hover_button_unittest.cc",
+      "../browser/ui/views/media_router/cast_dialog_sink_button_unittest.cc",
       "../browser/ui/views/page_info/page_info_bubble_view_unittest.cc",
       "../browser/ui/views/payments/payment_request_item_list_unittest.cc",
       "../browser/ui/views/payments/validating_textfield_unittest.cc",