[fuchsia] Add media blocking API to ApplicationController

Add SetBlockMediaLoading() to ApplicationController to enable media
loading to be blocked, and passes the call to fuchsia.web.Frame.

Bug: 1057860
Change-Id: Ib3c53e35d3fd1ffe2e43d01991ab7d85e2f025e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083565
Commit-Queue: Sharon Yang <yangsharon@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760084}

fuchsia/fidl/cast/application_controller.fidl

@@ -12,6 +12,11 @@ protocol ApplicationController {
   /// Enables or disables touch event processing.
   SetTouchInputEnabled(bool enable);
 
+  /// Sets whether to block all HTMLMediaElements in the frame from fetching and
+  /// loading media resources.
+  /// See fuchsia.web.Frame for usage details.
+  SetBlockMediaLoading(bool blocked);
+
   /// Connects to the application's media control & observation API.
   GetMediaPlayer(request<fuchsia.media.sessions2.Player> request);
 };

fuchsia/runners/cast/application_controller_impl.cc

@@ -36,3 +36,7 @@ void ApplicationControllerImpl::GetMediaPlayer(
     fidl::InterfaceRequest<fuchsia::media::sessions2::Player> request) {
   frame_->GetMediaPlayer(std::move(request));
 }
+
+void ApplicationControllerImpl::SetBlockMediaLoading(bool blocked) {
+  frame_->SetBlockMediaLoading(blocked);
+}

fuchsia/runners/cast/application_controller_impl.h

@@ -21,10 +21,12 @@ class ApplicationControllerImpl : public chromium::cast::ApplicationController {
   ~ApplicationControllerImpl() final;
 
  protected:
+  // chromium::cast::ApplicationController implementation.
   void SetTouchInputEnabled(bool enable) final;
   void GetMediaPlayer(
       ::fidl::InterfaceRequest<fuchsia::media::sessions2::Player> request)
       final;
+  void SetBlockMediaLoading(bool blocked) override;
 
  private:
   fidl::Binding<chromium::cast::ApplicationController> binding_;