[AudioStreamMonitor] Adds API to collect frame-level audibility.

content/browser/frame_host/render_frame_host_impl.h

 // Copyright 2013 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 CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 164 matching lines @@
   service_manager::BinderRegistry* GetInterfaceRegistry() override;
   service_manager::InterfaceProvider* GetRemoteInterfaces() override;
   AssociatedInterfaceProvider* GetRemoteAssociatedInterfaces() override;
   blink::WebPageVisibilityState GetVisibilityState() override;
   bool IsRenderFrameLive() override;
   bool IsCurrent() override;
   int GetProxyCount() override;
   void FilesSelectedInChooser(const std::vector<FileChooserFileInfo>& files,
                               FileChooserParams::Mode permissions) override;
   bool HasSelection() override;
+  bool IsAudible() override;
+  void OnAudioStateChanged(bool audible);

[nasko, 2017/06/21 21:04:07]

Move this method out of the section of RenderFrameHost overrides, likely further
down in the file. Then the .cc file will have to keep the same ordering.

[lpy, 2017/06/21 22:28:18]

Done.

   void RequestTextSurroundingSelection(
       const TextSurroundingSelectionCallback& callback,
       int max_length) override;
   void AllowBindings(int binding_flags) override;
   int GetEnabledBindings() const override;
   void BlockRequestsForFrame() override;
   void ResumeBlockedRequestsForFrame() override;
   void DisableBeforeUnloadHangMonitorForTesting() override;
   bool IsBeforeUnloadHangMonitorDisabledForTesting() override;
   bool IsFeatureEnabled(blink::WebFeaturePolicyFeature feature) override;
@@ skipping 980 matching lines @@
   std::unique_ptr<WebUIImpl> pending_web_ui_;
   WebUI::TypeID pending_web_ui_type_;
 
   // If true the associated WebUI should be reused when CommitPendingWebUI is
   // called (no pending instance should be set).
   bool should_reuse_web_ui_;
 
   // If true, then the RenderFrame has selected text.
   bool has_selection_;
 
+  // If true, then the RenderFrame is playing audio.
+  bool is_audible_;
+
   // PlzNavigate: The Previews state of the last navigation. This is used during
   // history navigation of subframes to ensure that subframes navigate with the
   // same Previews status as the top-level frame.
   PreviewsState last_navigation_previews_state_;
 
   mojo::Binding<mojom::FrameHostInterfaceBroker>
       frame_host_interface_broker_binding_;
   mojo::AssociatedBinding<mojom::FrameHost> frame_host_associated_binding_;
   mojom::FramePtr frame_;
   mojom::FrameBindingsControlAssociatedPtr frame_bindings_control_;
@@ skipping 60 matching lines @@
 
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_