Enable browser plugin compositing by default, but add a flag to disable it.

content/browser/renderer_host/gpu_message_filter.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.
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include "content/browser/renderer_host/gpu_message_filter.h"
 
@@ skipping 31 matching lines @@
       render_widget_helper_(render_widget_helper),
       weak_ptr_factory_(this) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
 #if defined(USE_AURA) || defined(OS_ANDROID)
   // We use the GPU process for UI on Aura, and we need to share renderer GL
   // contexts with the compositor context.
   share_contexts_ = true;
 #else
   // Share contexts when compositing webview plugin.
-  // Keep this behind a flag for now until we can run a
-  // stability experiment.
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableBrowserPluginCompositing))
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableBrowserPluginCompositing))
     share_contexts_ = true;
 #endif
 }
 
 GpuMessageFilter::~GpuMessageFilter() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 }
 
 bool GpuMessageFilter::OnMessageReceived(
     const IPC::Message& message,
@@ skipping 123 matching lines @@
 }
 
 void GpuMessageFilter::CreateCommandBufferCallback(
     IPC::Message* reply, int32 route_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   GpuHostMsg_CreateViewCommandBuffer::WriteReplyParams(reply, route_id);
   Send(reply);
 }
 
 }  // namespace content