Disable partial swaps for webview guest renderer until we can figure out how to do that properly.

content/renderer/render_widget.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.
 
 #ifndef CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 189 matching lines @@
   enum ShowIme {
     DO_NOT_SHOW_IME,
     SHOW_IME_IF_NEEDED
   };
 
   virtual void InstrumentWillBeginFrame() {}
   virtual void InstrumentDidBeginFrame() {}
   virtual void InstrumentDidCancelFrame() {}
   virtual void InstrumentWillComposite() {}
 
+  virtual bool AllowPartialSwap() const;
+
  protected:
   // Friend RefCounted so that the dtor can be non-public. Using this class
   // without ref-counting is an error.
   friend class base::RefCounted<RenderWidget>;
   // For unit tests.
   friend class RenderWidgetTest;
 
   enum ResizeAck {
     SEND_RESIZE_ACK,
     NO_RESIZE_ACK,
@@ skipping 441 matching lines @@
 
   // Specified whether the compositor will run in its own thread.
   bool is_threaded_compositing_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_