cc: Make HasImplThread() function work in AfterTest().

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 166 matching lines @@
   virtual void AfterTest() = 0;
   virtual void WillBeginTest();
   virtual void BeginTest() = 0;
   virtual void SetupTree();
 
   virtual void RunTest(bool threaded,
                        bool delegating_renderer,
                        bool impl_side_painting);
   virtual void RunTestWithImplSidePainting();
 
-  bool HasImplThread() { return proxy() ? proxy()->HasImplThread() : false; }
+  bool HasImplThread() { return !!impl_thread_; }
   base::SingleThreadTaskRunner* ImplThreadTaskRunner() {
     DCHECK(proxy());
     return proxy()->ImplThreadTaskRunner() ? proxy()->ImplThreadTaskRunner()
                                            : main_task_runner_.get();
   }
   base::SingleThreadTaskRunner* MainThreadTaskRunner() {
     return main_task_runner_.get();
   }
   Proxy* proxy() const {
     return layer_tree_host_ ? layer_tree_host_->proxy() : NULL;
@@ skipping 181 matching lines @@
   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 SINGLE_AND_MULTI_THREAD_BLOCKNOTIFY_TEST_F(TEST_FIXTURE_NAME) \
   SINGLE_THREAD_NOIMPL_TEST_F(TEST_FIXTURE_NAME);                     \
   MULTI_THREAD_TEST_F(TEST_FIXTURE_NAME)
 
 #endif  // CC_TEST_LAYER_TREE_TEST_H_