Use VP8 over PseudoTCP by default.

remoting/host/capturer.h

 // Copyright (c) 2010 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 REMOTING_HOST_CAPTURER_H_
 #define REMOTING_HOST_CAPTURER_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/lock.h"
@@ skipping 26 matching lines @@
 //     Mac version does not.
 //
 // Implementation has to ensure the following guarantees:
 // 1. Double buffering
 //    Since data can be read while another capture action is happening.
 class Capturer {
  public:
   // CaptureCompletedCallback is called when the capturer has completed.
   typedef Callback1<scoped_refptr<CaptureData> >::Type CaptureCompletedCallback;
 
-  explicit Capturer(MessageLoop* message_loop);
   virtual ~Capturer();
 
+  // Create platform-specific cpaturer.
+  static Capturer* Create(MessageLoop* message_loop);
+
   // Called when the screen configuration is changed.
   virtual void ScreenConfigurationChanged() = 0;
 
   // Return the width of the screen.
   virtual int width() const;
 
   // Return the height of the screen.
   virtual int height() const;
 
   // Return the pixel format of the screen.
@@ skipping 17 matching lines @@
   // If |inval_rects_| is empty, then this does nothing except
   // call the |callback| routine.
   //
   // It is OK to call this method while another thread is reading
   // data of the last capture.
   // There can be at most one concurrent read going on when this
   // method is called.
   virtual void CaptureInvalidRects(CaptureCompletedCallback* callback);
 
  protected:
+  explicit Capturer(MessageLoop* message_loop);
+
   // Update the list of |invalid_rects| to prepare for capturing the
   // screen data.
   // Depending on the platform implementation, this routine might:
   // (a) Analyze screen and calculate the list of rects that have changed
   //     since the last capture.
   // (b) Merge already-acculumated rects into a more optimal list (for
   //     example, by combining or removing rects).
   virtual void CalculateInvalidRects() = 0;
 
   // Capture the specified screen rects and call |callback| when complete.
@@ skipping 36 matching lines @@
   // capture.
   InvalidRects inval_rects_;
 
   // A lock protecting |inval_rects_| across threads.
   Lock inval_rects_lock_;
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CAPTURER_H_