Fix screen capture slowness in Chrome OS feedback report.

content/browser/renderer_host/media/video_capture_device_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_RENDERER_HOST_VIDEO_CAPTURE_DEVICE_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_VIDEO_CAPTURE_DEVICE_IMPL_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 27 matching lines @@
 
 // Thread-safe, refcounted proxy to the VideoCaptureOracle.  This proxy wraps
 // the VideoCaptureOracle, which decides which frames to capture, and a
 // VideoCaptureDevice::Client, which allocates and receives the captured
 // frames, in a lock to synchronize state between the two.
 class ThreadSafeCaptureOracle
     : public base::RefCountedThreadSafe<ThreadSafeCaptureOracle> {
  public:
   ThreadSafeCaptureOracle(scoped_ptr<media::VideoCaptureDevice::Client> client,
                           scoped_ptr<VideoCaptureOracle> oracle,
-                          const gfx::Size& capture_size,
+                          const gfx::Size& max_frame_size,
                           int frame_rate);
 
   // Called when a captured frame is available or an error has occurred.
   // If |success| is true then the frame provided is valid and |timestamp|
   // indicates when the frame was painted.
   // If |success| is false, both the frame provided and |timestamp| are invalid.
   typedef base::Callback<void(base::Time timestamp, bool success)>
       CaptureFrameCallback;
 
   bool ObserveEventAndDecideCapture(VideoCaptureOracle::Event event,
                                     base::Time event_time,
                                     scoped_refptr<media::VideoFrame>* storage,
                                     CaptureFrameCallback* callback);
 
   base::TimeDelta capture_period() const {
     return oracle_->capture_period();
   }
 
+  // Updates capture resolution based on the supplied source size and the
+  // maximum frame size.
+  void UpdateCaptureSize(const gfx::Size& source_size);
+
   // Stop new captures from happening (but doesn't forget the client).
   void Stop();
 
   // Signal an error to the client.
   void ReportError();
 
  private:
   friend class base::RefCountedThreadSafe<ThreadSafeCaptureOracle>;
   virtual ~ThreadSafeCaptureOracle();
 
   // Callback invoked on completion of all captures.
   void DidCaptureFrame(
       scoped_refptr<media::VideoCaptureDevice::Client::Buffer> buffer,
       int frame_number,
       base::Time timestamp,
       bool success);
   // Protects everything below it.
   base::Lock lock_;
 
   // Recipient of our capture activity.
   scoped_ptr<media::VideoCaptureDevice::Client> client_;
 
   // Makes the decision to capture a frame.
   const scoped_ptr<VideoCaptureOracle> oracle_;
 
+  // The maximum frame size.
+  const gfx::Size max_frame_size_;
+
   // The current capturing resolution and frame rate.
-  const gfx::Size capture_size_;
+  gfx::Size capture_size_;
   const int frame_rate_;
 };
 
 // Keeps track of the video capture source frames and executes copying on the
 // UI BrowserThread.
 class VideoCaptureMachine {
  public:
   VideoCaptureMachine() : started_(false) {}
   virtual ~VideoCaptureMachine() {}
 
@@ skipping 69 matching lines @@
   // system with direct access to |client_|.
   scoped_refptr<ThreadSafeCaptureOracle> oracle_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceImpl);
 };
 
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_VIDEO_CAPTURE_DEVICE_IMPL_H_