Add frame refresh to VideoCaptureDevice, and buffer pool resurrection.

content/browser/renderer_host/media/video_capture_device_client.cc

Index: content/browser/renderer_host/media/video_capture_device_client.cc
diff --git a/content/browser/renderer_host/media/video_capture_device_client.cc b/content/browser/renderer_host/media/video_capture_device_client.cc
index d5cb149bbadad2e2376a41eb6271ea81411e413f..4d508c4e3f0c9659736bcfbb68511ed15e50db15 100644
--- a/content/browser/renderer_host/media/video_capture_device_client.cc
+++ b/content/browser/renderer_host/media/video_capture_device_client.cc
@@ -270,21 +270,17 @@ VideoCaptureDeviceClient::ReserveOutputBuffer(
   // it's a ShMem GMB or a DmaBuf GMB.
   int buffer_id_to_drop = VideoCaptureBufferPool::kInvalidId;
   const int buffer_id = buffer_pool_->ReserveForProducer(
-      pixel_format, pixel_storage, frame_size, &buffer_id_to_drop);
-  if (buffer_id == VideoCaptureBufferPool::kInvalidId)
-    return NULL;
-
-  scoped_ptr<media::VideoCaptureDevice::Client::Buffer> output_buffer(
-      new AutoReleaseBuffer(buffer_pool_, buffer_id));
-
+      frame_size, pixel_format, pixel_storage, &buffer_id_to_drop);
   if (buffer_id_to_drop != VideoCaptureBufferPool::kInvalidId) {
     BrowserThread::PostTask(BrowserThread::IO,
         FROM_HERE,
         base::Bind(&VideoCaptureController::DoBufferDestroyedOnIOThread,
                    controller_, buffer_id_to_drop));
   }
-
-  return output_buffer;
+  if (buffer_id == VideoCaptureBufferPool::kInvalidId)
+    return nullptr;
+  return make_scoped_ptr<Buffer>(
+      new AutoReleaseBuffer(buffer_pool_, buffer_id));
 }
 
 void VideoCaptureDeviceClient::OnIncomingCapturedBuffer(
@@ -340,6 +336,19 @@ void VideoCaptureDeviceClient::OnIncomingCapturedVideoFrame(
           timestamp));
 }
 
+scoped_ptr<media::VideoCaptureDevice::Client::Buffer>
+VideoCaptureDeviceClient::ResurrectLastOutputBuffer(
+    const gfx::Size& dimensions,
+    media::VideoPixelFormat format,
+    media::VideoPixelStorage storage) {
+  const int buffer_id =
+      buffer_pool_->ResurrectLastForProducer(dimensions, format, storage);
+  if (buffer_id == VideoCaptureBufferPool::kInvalidId)
+    return nullptr;
+  return make_scoped_ptr<Buffer>(
+      new AutoReleaseBuffer(buffer_pool_, buffer_id));
+}
+
 void VideoCaptureDeviceClient::OnError(
     const tracked_objects::Location& from_here,
     const std::string& reason) {