Tab/Desktop Capture: Use requests instead of timer-based refreshing.

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/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "base/timer/timer.h"
 #include "content/browser/media/capture/cursor_renderer_aura.h"
 #include "media/capture/content/screen_capture_device_core.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_observer.h"
 #include "ui/base/cursor/cursors_aura.h"
 #include "ui/compositor/compositor.h"
 
 namespace cc {
 
 class CopyOutputResult;
@@ skipping 11 matching lines @@
       public ui::CompositorObserver {
  public:
   AuraWindowCaptureMachine();
   ~AuraWindowCaptureMachine() override;
 
   // VideoCaptureMachine overrides.
   void Start(const scoped_refptr<media::ThreadSafeCaptureOracle>& oracle_proxy,
              const media::VideoCaptureParams& params,
              const base::Callback<void(bool)> callback) override;
   void Stop(const base::Closure& callback) override;
+  void MaybeCaptureForRefresh() override;
 
   // Implements aura::WindowObserver.
   void OnWindowBoundsChanged(aura::Window* window,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
   void OnWindowDestroying(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<media::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.
+  // |dirty| is false for refresh requests and true for compositor updates.
   void Capture(bool dirty);
 
   // Update capture size. Must be called on the UI thread.
   void UpdateCaptureSize();
 
   using CaptureFrameCallback =
       media::ThreadSafeCaptureOracle::CaptureFrameCallback;
 
   // Response callback for cc::Layer::RequestCopyOfOutput().
   void DidCopyOutput(
@@ skipping 15 matching lines @@
       base::WeakPtr<AuraWindowCaptureMachine> machine,
       base::TimeTicks start_time,
       const CaptureFrameCallback& capture_frame_cb,
       const scoped_refptr<media::VideoFrame>& target,
       scoped_ptr<cc::SingleReleaseCallback> release_callback,
       bool result);
 
   // The window associated with the desktop.
   aura::Window* desktop_window_;
 
-  // The timer that kicks off period captures.
-  base::Timer timer_;
-
   // Whether screen capturing or window capture.
   bool screen_capture_;
 
   // Makes all the decisions about which frames to copy, and how.
   scoped_refptr<media::ThreadSafeCaptureOracle> oracle_proxy_;
 
   // The capture parameters for this capture.
   media::VideoCaptureParams capture_params_;
 
   // YUV readback pipeline.
@@ skipping 11 matching lines @@
   // immediately when InternalStop() is called to ensure that no more captured
   // frames will be delivered to the client.
   base::WeakPtrFactory<AuraWindowCaptureMachine> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AuraWindowCaptureMachine);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_CAPTURE_AURA_WINDOW_CAPTURE_MACHINE_H_