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

content/common/gpu/texture_image_transport_surface.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.
 
 #include "content/common/gpu/texture_image_transport_surface.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 260 matching lines @@
 
   DCHECK(!is_swap_buffers_pending_);
   is_swap_buffers_pending_ = true;
   return true;
 }
 
 std::string TextureImageTransportSurface::GetExtensions() {
   std::string extensions = gfx::GLSurface::GetExtensions();
   extensions += extensions.empty() ? "" : " ";
   extensions += "GL_CHROMIUM_front_buffer_cached ";
-  extensions += "GL_CHROMIUM_post_sub_buffer";
+  if (handle_.transport_type != gfx::TEXTURE_TRANSPORT_NO_PARTIAL_SWAP)
+    extensions += "GL_CHROMIUM_post_sub_buffer";
   return extensions;
 }
 
 gfx::Size TextureImageTransportSurface::GetSize() {
   gfx::Size size = current_size_;
 
   // OSMesa expects a non-zero size.
   return gfx::Size(size.width() == 0 ? 1 : size.width(),
                    size.height() == 0 ? 1 : size.height());
 }
@@ skipping 199 matching lines @@
       GL_TEXTURE_2D,
       texture->mailbox_name,
       definition.release(),
       NULL);
   DCHECK(success);
   texture->service_id = 0;
   texture->mailbox_name = MailboxName();
 }
 
 }  // namespace content