cc: Add tile-free software compositing mode.

cc/output/output_surface.cc

 // Copyright (c) 2013 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 "cc/output/output_surface.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 53 matching lines @@
     scoped_ptr<cc::SoftwareOutputDevice> software_device)
     : client_(NULL),
       context3d_(context3d.Pass()),
       software_device_(software_device.Pass()),
       has_gl_discard_backbuffer_(false) {
 }
 
 OutputSurface::~OutputSurface() {
 }
 
+bool OutputSurface::ForcedDrawToSoftwareDevice() const {
+  return false;
+}
+
 bool OutputSurface::BindToClient(
     cc::OutputSurfaceClient* client) {
   DCHECK(client);
   client_ = client;
   if (!context3d_)
     return true;
   if (!context3d_->makeContextCurrent())
     return false;
 
   string extensions_string = UTF16ToASCII(context3d_->getString(GL_EXTENSIONS));
@@ skipping 45 matching lines @@
 }
 
 void OutputSurface::PostSubBuffer(gfx::Rect rect,
                                   const LatencyInfo& latency_info) {
   DCHECK(context3d_);
   context3d_->postSubBufferCHROMIUM(
       rect.x(), rect.y(), rect.width(), rect.height());
 }
 
 }  // namespace cc