From Video Capture, abolish OnFrameInfo and enable resolution changes

media/video/capture/video_capture_device.h

 // Copyright (c) 2012 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.
 //
 // VideoCaptureDevice is the abstract base class for realizing video capture
 // device support in Chromium. It provides the interface for OS dependent
 // implementations.
 // The class is created and functions are invoked on a thread owned by
 // VideoCaptureManager. Capturing is done on other threads, depending on the OS
 // specific implementation.
@@ skipping 107 matching lines @@
     // Allow generated copy constructor and assignment.
   };
 
   class MEDIA_EXPORT Client {
    public:
     virtual ~Client() {}
 
     // Reserve an output buffer into which a video frame can be captured
     // directly. If all buffers are currently busy, returns NULL.
     //
-    // The returned VideoFrames will always be allocated with a YV12 format. The
-    // size will match that specified by an earlier call to OnFrameInfo. It is
-    // the VideoCaptureDevice's responsibility to obey whatever stride and
-    // memory layout are indicated on the returned VideoFrame object.
+    // The returned VideoFrames will always be allocated with a YV12 format and
+    // have dimensions matching |size|. It is the VideoCaptureDevice's
+    // responsibility to obey whatever stride and memory layout are indicated on
+    // the returned VideoFrame object.
     //
     // The output buffer stays reserved for use by the calling
     // VideoCaptureDevice until either the last reference to the VideoFrame is
     // released, or until the buffer is passed back to the Client's
     // OnIncomingCapturedFrame() method.
-    virtual scoped_refptr<media::VideoFrame> ReserveOutputBuffer() = 0;
+    virtual scoped_refptr<media::VideoFrame> ReserveOutputBuffer(
+        const gfx::Size& size) = 0;
 
     // Captured a new video frame as a raw buffer. The size, color format, and
     // layout are taken from the parameters specified by an earlier call to
     // OnFrameInfo(). |data| must be packed, with no padding between rows and/or
     // color planes.
     //
     // This method will try to reserve an output buffer and copy from |data|
     // into the output buffer. If no output buffer is available, the frame will
     // be silently dropped.
     virtual void OnIncomingCapturedFrame(const uint8* data,
@@ skipping 67 matching lines @@
   // If deallocation is done asynchronously, then the device implementation must
   // ensure that a subsequent AllocateAndStart() operation targeting the same ID
   // would be sequenced through the same task runner, so that deallocation
   // happens first.
   virtual void StopAndDeAllocate() = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_H_