Add LayerTreeHostSettings for synchronous compositor

content/renderer/render_widget.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_widget.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 277 matching lines @@
   // If we are swapping in, we call AddRefProcess to prevent the process from
   // exiting.
   if (!is_swapped_out)
     RenderProcess::current()->AddRefProcess();
 }
 
 bool RenderWidget::AllowPartialSwap() const {
   return true;
 }
 
+bool RenderWidget::EnableSynchronousCompositing() const {
+#if defined(OS_ANDROID)
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableSynchronousRendererCompositor)) {
+    return true;
+  }
+#endif
+  return false;
+}
+
 bool RenderWidget::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(RenderWidget, message)
     IPC_MESSAGE_HANDLER(InputMsg_HandleInputEvent, OnHandleInputEvent)
     IPC_MESSAGE_HANDLER(InputMsg_MouseCaptureLost, OnMouseCaptureLost)
     IPC_MESSAGE_HANDLER(InputMsg_SetFocus, OnSetFocus)
     IPC_MESSAGE_HANDLER(ViewMsg_Close, OnClose)
     IPC_MESSAGE_HANDLER(ViewMsg_CreatingNew_ACK, OnCreatingNewAck)
     IPC_MESSAGE_HANDLER(ViewMsg_Resize, OnResize)
     IPC_MESSAGE_HANDLER(ViewMsg_ChangeResizeRect, OnChangeResizeRect)
@@ skipping 2015 matching lines @@
 
   if (!context->Initialize(
           attributes,
           false /* bind generates resources */,
           CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE))
     return NULL;
   return context.release();
 }
 
 }  // namespace content