cc: Split Proxy and TaskRunnerProvider for the LayerTreeHost

cc/trees/layer_tree_host_unittest_proxy.cc

 // Copyright 2014 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 "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "cc/test/fake_content_layer_client.h"
 #include "cc/test/fake_picture_layer.h"
 #include "cc/test/layer_tree_test.h"
 #include "cc/trees/thread_proxy.h"
@@ skipping 66 matching lines @@
       : update_check_layer_(
             FakePictureLayer::Create(layer_settings(), &client_)) {}
   ~ThreadProxyTest() override {}
 
   void SetupTree() override {
     layer_tree_host()->SetRootLayer(update_check_layer_);
     ProxyTest::SetupTree();
   }
 
   const ThreadProxy::MainThreadOnly& ThreadProxyMainOnly() const {
+    DCHECK(task_runner_provider());
+    DCHECK(task_runner_provider()->HasImplThread());
     DCHECK(proxy());
-    DCHECK(proxy()->HasImplThread());
     return static_cast<const ThreadProxy*>(proxy())->main();
   }
 
   const ThreadProxy::CompositorThreadOnly& ThreadProxyImplOnly() const {
+    DCHECK(task_runner_provider());
+    DCHECK(task_runner_provider()->HasImplThread());
     DCHECK(proxy());
-    DCHECK(proxy()->HasImplThread());
     return static_cast<const ThreadProxy*>(proxy())->impl();
   }
 
  protected:
   FakeContentLayerClient client_;
   scoped_refptr<FakePictureLayer> update_check_layer_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ThreadProxyTest);
 };
@@ skipping 238 matching lines @@
 
  private:
   int commits_completed_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadProxyTestCommitWaitsForActivation);
 };
 
 THREAD_PROXY_TEST_F(ThreadProxyTestCommitWaitsForActivation);
 
 }  // namespace cc