Tab Audio Capture: Browser-side connect/disconnect functionality.

content/browser/renderer_host/media/web_contents_video_capture_device.cc

 // 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.
 //
 // Implementation notes: This needs to work on a variety of hardware
 // configurations where the speed of the CPU and GPU greatly affect overall
 // performance.  Therefore, the process of capturing has been split up into a
 // pipeline of three stages.  Each stage executes on its own thread:
 //
 //   1. Capture: A bitmap is snapshotted/copied from the RenderView's backing
@@ skipping 123 matching lines @@
   }
   // Make each dimension a positive, even number; if not already.
   fitted_width = std::max(kMinFrameWidth, MakeEven(fitted_width));
   fitted_height = std::max(kMinFrameHeight, MakeEven(fitted_height));
 
   *fitted_size = gfx::Size(fitted_width, fitted_height);
 }
 
 // Keeps track of the RenderView to be sourced, and executes copying of the
 // backing store on the UI BrowserThread.
+// TODO(miu): Use WebContentsCaptureUtil::RenderViewTracker instead of doing the
+// observing ourselves here.
 class BackingStoreCopier : public WebContentsObserver {
  public:
   // Result status and done callback used with StartCopy().
   enum Result {
     OK,
     TRANSIENT_ERROR,
     NO_SOURCE,
   };
   typedef base::Callback<void(Result result,
                               scoped_ptr<skia::PlatformBitmap> capture,
@@ skipping 896 matching lines @@
   capturer_->SetConsumer(NULL);
   capturer_->DeAllocate();
 }
 
 const media::VideoCaptureDevice::Name&
 WebContentsVideoCaptureDevice::device_name() {
   return device_name_;
 }
 
 }  // namespace content