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

cc/test/layer_tree_test.cc

 // Copyright 2011 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/test/layer_tree_test.h"
 
 #include "base/command_line.h"
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_registrar.h"
 #include "cc/animation/layer_animation_controller.h"
@@ skipping 233 matching lines @@
 
   virtual void Layout() OVERRIDE {
     test_hooks_->Layout();
   }
 
   virtual void ApplyScrollAndScale(gfx::Vector2d scroll_delta,
                                    float scale) OVERRIDE {
     test_hooks_->ApplyScrollAndScale(scroll_delta, scale);
   }
 
-  virtual scoped_ptr<OutputSurface> CreateOutputSurface() OVERRIDE {
-    return test_hooks_->CreateOutputSurface();
+  virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback)
+      OVERRIDE {
+    return test_hooks_->CreateOutputSurface(fallback);
   }
 
   virtual void DidInitializeOutputSurface(bool succeeded) OVERRIDE {
     test_hooks_->DidInitializeOutputSurface(succeeded);
   }
 
   virtual void DidFailToInitializeOutputSurface() OVERRIDE {
     test_hooks_->DidFailToInitializeOutputSurface();
   }
 
@@ skipping 327 matching lines @@
 
   ASSERT_FALSE(layer_tree_host_.get());
   client_.reset();
   if (timed_out_) {
     FAIL() << "Test timed out";
     return;
   }
   AfterTest();
 }
 
-scoped_ptr<OutputSurface> LayerTreeTest::CreateOutputSurface() {
+scoped_ptr<OutputSurface> LayerTreeTest::CreateOutputSurface(bool fallback) {
   scoped_ptr<FakeOutputSurface> output_surface;
   if (delegating_renderer_)
     output_surface = FakeOutputSurface::CreateDelegating3d();
   else
     output_surface = FakeOutputSurface::Create3d();
   output_surface_ = output_surface.get();
   return output_surface.PassAs<OutputSurface>();
 }
 
 scoped_refptr<cc::ContextProvider> LayerTreeTest::
     OffscreenContextProviderForMainThread() {
   if (!main_thread_contexts_.get() ||
       main_thread_contexts_->DestroyedOnMainThread()) {
     main_thread_contexts_ = FakeContextProvider::Create();
     if (!main_thread_contexts_->BindToCurrentThread())
       main_thread_contexts_ = NULL;
   }
   return main_thread_contexts_;
 }
 
 scoped_refptr<cc::ContextProvider> LayerTreeTest::
     OffscreenContextProviderForCompositorThread() {
   if (!compositor_thread_contexts_.get() ||
       compositor_thread_contexts_->DestroyedOnMainThread())
     compositor_thread_contexts_ = FakeContextProvider::Create();
   return compositor_thread_contexts_;
 }
 
 }  // namespace cc