Chromium compositor change implementing page-scale driven pinch-zoom.

content/renderer/render_thread_impl.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/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 558 matching lines @@
 
   WebKit::WebCompositorSupport* compositor_support =
       WebKit::Platform::current()->compositorSupport();
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   compositor_support->setAcceleratedAnimationEnabled(
       !command_line.HasSwitch(switches::kDisableThreadedAnimation));
   compositor_support->setPerTilePaintingEnabled(
       command_line.HasSwitch(switches::kEnablePerTilePainting));
   compositor_support->setPartialSwapEnabled(
       command_line.HasSwitch(switches::kEnablePartialSwap));
+  compositor_support->setPageScalePinchZoomEnabled(
+      command_line.HasSwitch(switches::kEnablePinchInCompositor));
 
   // TODO(fsamuel): Guests don't currently support threaded compositing.
   // This should go away with the new design of the browser plugin.
   // The new design can be tracked at: http://crbug.com/134492.
   bool is_guest = CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kGuestRenderer);
   bool enable = content::IsThreadedCompositingEnabled() && !is_guest;
   if (enable) {
     compositor_thread_.reset(new CompositorThread(this));
     AddFilter(compositor_thread_->GetMessageFilter());
@@ skipping 559 matching lines @@
 
 scoped_refptr<base::MessageLoopProxy>
 RenderThreadImpl::GetFileThreadMessageLoopProxy() {
   DCHECK(message_loop() == MessageLoop::current());
   if (!file_thread_.get()) {
     file_thread_.reset(new base::Thread("Renderer::FILE"));
     file_thread_->Start();
   }
   return file_thread_->message_loop_proxy();
 }