Add a flag to allow renderer to use software compositor when GL compositor doesn't work.

cc/layers/texture_layer_unittest.cc

 // Copyright 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 "cc/layers/texture_layer.h"
 
 #include <string>
 
 #include "base/callback.h"
 #include "cc/layers/texture_layer_client.h"
@@ skipping 775 matching lines @@
     : public LayerTreeTest,
       public TextureLayerClient {
  public:
   TextureLayerClientTest()
       : context_(NULL),
         texture_(0),
         commit_count_(0),
         expected_used_textures_on_draw_(0),
         expected_used_textures_on_commit_(0) {}
 
-  virtual scoped_ptr<OutputSurface> CreateOutputSurface() OVERRIDE {
+  virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback)
+      OVERRIDE {
     scoped_ptr<TestWebGraphicsContext3D> context(
         TestWebGraphicsContext3D::Create());
     context_ = context.get();
     texture_ = context->createTexture();
     return FakeOutputSurface::Create3d(
         context.PassAs<WebKit::WebGraphicsContext3D>()).PassAs<OutputSurface>();
   }
 
   virtual unsigned PrepareTexture() OVERRIDE {
     return texture_;
@@ skipping 93 matching lines @@
 
 // Test recovering from a lost context.
 class TextureLayerLostContextTest
     : public LayerTreeTest,
       public TextureLayerClient {
  public:
   TextureLayerLostContextTest()
       : texture_(0),
         draw_count_(0) {}
 
-  virtual scoped_ptr<OutputSurface> CreateOutputSurface() OVERRIDE {
+  virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback)
+      OVERRIDE {
     texture_context_ = TestWebGraphicsContext3D::Create();
     texture_ = texture_context_->createTexture();
     return CreateFakeOutputSurface();
   }
 
   virtual unsigned PrepareTexture() OVERRIDE {
     if (draw_count_ == 0) {
       texture_context_->loseContextCHROMIUM(GL_GUILTY_CONTEXT_RESET_ARB,
           GL_INNOCENT_CONTEXT_RESET_ARB);
     }
@@ skipping 189 matching lines @@
   int callback_count_;
   scoped_refptr<Layer> root_;
   scoped_refptr<TextureLayer> layer_;
 };
 
 SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
     TextureLayerWithMailboxImplThreadDeleted);
 
 }  // namespace
 }  // namespace cc