[chromecast] Host QueryableDataHost in CastWebContents

CastWebContents now provides a getter to access QueryableDataHost. If
InitParams::provide_queryable_data_host is set false, the getter will
return a nullptr (for non Cast application page).

Merge-With: eureka-internal/342948

Bug: internal b/144316072
Test: CQ
Change-Id: I44a2aefbed9fcdcf5481423d073ffc42a8ee358d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1956252Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Commit-Queue: Jiawei Li <lijiawei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722720}

chromecast/browser/cast_web_contents.h

@@ -30,6 +30,8 @@ class WebContents;
 
 namespace chromecast {
 
+class QueryableDataHost;
+
 struct RendererFeature {
   const std::string name;
   base::Value value;
@@ -210,6 +212,10 @@ class CastWebContents {
     bool enable_websql = false;
     // Enable mixer audio support for this CastWebContents.
     bool enable_mixer_audio = false;
+    // Whether to provide a QueryableDataHost for this CastWebContents.
+    // Clients can use it to send queryable values to the render frames.
+    // queryable_data_host() will return a nullptr if this is false.
+    bool enable_queryable_data_host = false;
 
     InitParams();
     InitParams(const InitParams& other);
@@ -244,6 +250,10 @@ class CastWebContents {
   virtual content::WebContents* web_contents() const = 0;
   virtual PageState page_state() const = 0;
 
+  // Returns QueryableDataHost that is used to push values to the renderer.
+  // Returns nullptr if the new queryable data bindings is enabled.
+  virtual QueryableDataHost* queryable_data_host() const = 0;
+
   // ===========================================================================
   // Initialization and Setup
   // ===========================================================================

chromecast/browser/cast_web_contents_impl.cc

@@ -13,10 +13,13 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/sequenced_task_runner_handle.h"
 #include "base/values.h"
+#include "chromecast/activity/queryable_data_host.h"
+#include "chromecast/base/cast_features.h"
 #include "chromecast/base/chromecast_switches.h"
 #include "chromecast/base/metrics/cast_metrics_helper.h"
 #include "chromecast/browser/cast_browser_process.h"
 #include "chromecast/browser/devtools/remote_debugging_server.h"
+#include "chromecast/browser/queryable_data_host_cast.h"
 #include "chromecast/common/mojom/media_playback_options.mojom.h"
 #include "chromecast/common/mojom/on_load_script_injector.mojom.h"
 #include "chromecast/common/mojom/queryable_data_store.mojom.h"
@@ -139,6 +142,13 @@ CastWebContentsImpl::CastWebContentsImpl(content::WebContents* web_contents,
   if (GetSwitchValueBoolean(switches::kDisableMojoRenderer, false)) {
     use_cma_renderer_ = false;
   }
+
+  // Provides QueryableDataHostCast if the new QueryableData bindings is not
+  // enabled.
+  if (init_params.enable_queryable_data_host) {
+    queryable_data_host_ =
+        std::make_unique<QueryableDataHostCast>(web_contents_);
+  }
 }
 
 CastWebContentsImpl::~CastWebContentsImpl() {
@@ -167,6 +177,10 @@ CastWebContents::PageState CastWebContentsImpl::page_state() const {
   return page_state_;
 }
 
+QueryableDataHost* CastWebContentsImpl::queryable_data_host() const {
+  return queryable_data_host_.get();
+}
+
 void CastWebContentsImpl::AddRendererFeatures(
     std::vector<RendererFeature> features) {
   for (auto& feature : features) {

chromecast/browser/cast_web_contents_impl.h

@@ -29,6 +29,8 @@
 
 namespace chromecast {
 
+class QueryableDataHost;
+
 namespace shell {
 class RemoteDebuggingServer;
 }  // namespace shell
@@ -43,6 +45,8 @@ class CastWebContentsImpl : public CastWebContents,
   content::WebContents* web_contents() const override;
   PageState page_state() const override;
 
+  QueryableDataHost* queryable_data_host() const override;
+
   // CastWebContents implementation:
   int tab_id() const override;
   void AddRendererFeatures(std::vector<RendererFeature> features) override;
@@ -177,6 +181,8 @@ class CastWebContentsImpl : public CastWebContents,
   base::flat_map<InterfaceSet, service_manager::InterfaceProvider*>
       interface_providers_map_;
 
+  std::unique_ptr<QueryableDataHost> queryable_data_host_;
+
   SEQUENCE_CHECKER(sequence_checker_);
   base::WeakPtrFactory<CastWebContentsImpl> weak_factory_;