cc: Fix use-after-frees for LayerTreeHostAnimationTest.

cc/test/layer_tree_test.h

 // 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.
 
 #ifndef CC_TEST_LAYER_TREE_TEST_H_
 #define CC_TEST_LAYER_TREE_TEST_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread.h"
 #include "cc/animation/animation_delegate.h"
@@ skipping 110 matching lines @@
 
   virtual void AfterTest() = 0;
   virtual void WillBeginTest();
   virtual void BeginTest() = 0;
   virtual void SetupTree();
 
   virtual void RunTest(CompositorMode mode, bool delegating_renderer);
 
   bool HasImplThread() const { return !!impl_thread_; }
   base::SingleThreadTaskRunner* ImplThreadTaskRunner() {
-    DCHECK(task_runner_provider());
-    base::SingleThreadTaskRunner* impl_thread_task_runner =
-        task_runner_provider()->ImplThreadTaskRunner();
-    return impl_thread_task_runner ? impl_thread_task_runner
-                                   : main_task_runner_.get();
+    return impl_task_runner_.get();
   }
   base::SingleThreadTaskRunner* MainThreadTaskRunner() {
     return main_task_runner_.get();
   }
   Proxy* proxy() const {
     return layer_tree_host_ ? layer_tree_host_->proxy() : NULL;
   }
   Proxy* remote_client_proxy() const;
   TaskRunnerProvider* task_runner_provider() const;
   TaskGraphRunner* task_graph_runner() const;
@@ skipping 55 matching lines @@
   bool end_when_begin_returns_;
   bool timed_out_;
   bool scheduled_;
   bool started_;
   bool ended_;
   bool delegating_renderer_;
 
   int timeout_seconds_;
 
   scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner_;
   std::unique_ptr<base::Thread> impl_thread_;
   std::unique_ptr<SharedBitmapManager> shared_bitmap_manager_;
   std::unique_ptr<TestGpuMemoryBufferManager> gpu_memory_buffer_manager_;
   std::unique_ptr<TestTaskGraphRunner> task_graph_runner_;
   base::CancelableClosure timeout_;
   scoped_refptr<TestContextProvider> compositor_contexts_;
   base::WeakPtr<LayerTreeTest> main_thread_weak_ptr_;
   base::WeakPtrFactory<LayerTreeTest> weak_factory_;
 };
 
@@ skipping 49 matching lines @@
 #define SINGLE_AND_MULTI_THREAD_TEST_F(TEST_FIXTURE_NAME)            \
   SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(TEST_FIXTURE_NAME); \
   SINGLE_AND_MULTI_THREAD_DELEGATING_RENDERER_TEST_F(TEST_FIXTURE_NAME)
 
 // Some tests want to control when notify ready for activation occurs,
 // but this is not supported in the single-threaded case.
 #define MULTI_THREAD_BLOCKNOTIFY_TEST_F(TEST_FIXTURE_NAME) \
   MULTI_THREAD_TEST_F(TEST_FIXTURE_NAME)
 
 #endif  // CC_TEST_LAYER_TREE_TEST_H_