Use XDamage in Virtual Me2Me.

remoting/host/capturer.h

 // Copyright (c) 2011 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 "remoting/base/capture_data.h"
@@ skipping 28 matching lines @@
  public:
   // CaptureCompletedCallback is called when the capturer has completed.
   typedef base::Callback<void(scoped_refptr<CaptureData>)>
       CaptureCompletedCallback;
 
   virtual ~Capturer() {};
 
   // Create platform-specific capturer.
   static Capturer* Create();
 
+#if defined(OS_LINUX)
+  // Set whether the Capturer should try to use X DAMAGE support if it is
+  // available.  This needs to be called before the Capturer is created.
+  // This is used by the Virtual Me2Me host, since the XDamage extension is
+  // known to work reliably in this case.
+
+  // TODO(lambroslambrou): This currently sets a global flag, referenced during
+  // Capturer::Create().  This is a temporary solution, until the
+  // DesktopEnvironment class is refactored to allow applications to control
+  // the creation of various stubs (including the Capturer) - see
+  // http://crbug.com/104544
+  static void EnableXDamage(bool enable);
+#endif  // defined(OS_LINUX)
+
   // Called when the screen configuration is changed.
   virtual void ScreenConfigurationChanged() = 0;
 
   // Return the pixel format of the screen.
   virtual media::VideoFrame::Format pixel_format() const = 0;
 
   // Clear out the invalid region.
   virtual void ClearInvalidRegion() = 0;
 
   // Invalidate the specified region.
@@ skipping 18 matching lines @@
   virtual void CaptureInvalidRegion(
       const CaptureCompletedCallback& callback) = 0;
 
   // Get the size of the most recently captured screen.
   virtual const SkISize& size_most_recent() const = 0;
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CAPTURER_H_