Implement screen capture for android

content/browser/media/capture/aura_window_capture_machine.h

 // Copyright 2015 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_MEDIA_CAPTURE_AURA_WINDOW_CAPTURE_MACHINE_H_
 #define CONTENT_BROWSER_MEDIA_CAPTURE_AURA_WINDOW_CAPTURE_MACHINE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
@@ skipping 17 matching lines @@
 class AuraWindowCaptureMachine
     : public VideoCaptureMachine,
       public aura::WindowObserver,
       public ui::CompositorObserver,
       public base::SupportsWeakPtr<AuraWindowCaptureMachine> {
  public:
   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.
   void OnWindowBoundsChanged(aura::Window* window,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
   void OnWindowDestroyed(aura::Window* window) override;
   void OnWindowAddedToRootWindow(aura::Window* window) override;
   void OnWindowRemovingFromRootWindow(aura::Window* window,
                                       aura::Window* new_root) override;
 
   // Implements ui::CompositorObserver.
   void OnCompositingDidCommit(ui::Compositor* compositor) override {}
   void OnCompositingStarted(ui::Compositor* compositor,
                             base::TimeTicks start_time) override {}
   void OnCompositingEnded(ui::Compositor* compositor) override;
   void OnCompositingAborted(ui::Compositor* compositor) override {}
   void OnCompositingLockStateChanged(ui::Compositor* compositor) override {}
   void OnCompositingShuttingDown(ui::Compositor* compositor) override {}
 
   // Sets the window to use for capture.
   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);
 
   // Update capture size. Must be called on the UI thread.
   void UpdateCaptureSize();
 
   // Response callback for cc::Layer::RequestCopyOfOutput().
   void DidCopyOutput(
       scoped_refptr<media::VideoFrame> video_frame,
@@ skipping 45 matching lines @@
   // TODO(jiayl): Remove power_save_blocker_ when there is an API to keep the
   // screen from sleeping for the drive-by web.
   scoped_ptr<PowerSaveBlocker> power_save_blocker_;
 
   DISALLOW_COPY_AND_ASSIGN(AuraWindowCaptureMachine);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_CAPTURE_AURA_WINDOW_CAPTURE_MACHINE_H_