Implement screen capture for android

content/browser/media/capture/aura_window_capture_machine.h

Index: content/browser/media/capture/aura_window_capture_machine.h
diff --git a/content/browser/media/capture/aura_window_capture_machine.h b/content/browser/media/capture/aura_window_capture_machine.h
index f41e73ce460af2a7bdcf3bfe6739b037aa01307f..4b3b212b5a5951c2db7795c5b6a205c8b8835d2b 100644
--- a/content/browser/media/capture/aura_window_capture_machine.h
+++ b/content/browser/media/capture/aura_window_capture_machine.h
@@ -35,8 +35,9 @@ class AuraWindowCaptureMachine
   ~AuraWindowCaptureMachine() override;
 
   // VideoCaptureFrameSource overrides.
-  bool Start(const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy,
-             const media::VideoCaptureParams& params) override;
+  void Start(const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy,
+             const media::VideoCaptureParams& params,
+             const base::Callback<void(bool)> callback) override;
   void Stop(const base::Closure& callback) override;
 
   // Implements aura::WindowObserver.
@@ -61,6 +62,10 @@ class AuraWindowCaptureMachine
   void SetWindow(aura::Window* window);
 
  private:
+  bool InternalStart(const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy,
+                     const media::VideoCaptureParams& params);
+  void InternalStop(const base::Closure& callback);
+
   // Captures a frame.
   // |dirty| is false for timer polls and true for compositor updates.
   void Capture(bool dirty);