cc: Split Proxy to eliminate unnecessary dependencies on the impl side

cc/test/fake_impl_thread_verifier.h

Index: cc/test/fake_impl_thread_verifier.h
diff --git a/cc/test/fake_impl_thread_verifier.h b/cc/test/fake_impl_thread_verifier.h
new file mode 100644
index 0000000000000000000000000000000000000000..ffaf219377a4e048ba31e4e19cad4ab70282eb9a
--- /dev/null
+++ b/cc/test/fake_impl_thread_verifier.h
@@ -0,0 +1,34 @@
+// Copyright 2015 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_FAKE_IMPL_THREAD_VERIFIER_H_
+#define CC_TEST_FAKE_IMPL_THREAD_VERIFIER_H_
+
+#include "base/thread_task_runner_handle.h"
+#include "cc/trees/single_thread_proxy.h"
+#include "cc/trees/thread_verifier.h"
+
+namespace base {
+class SingleThreadIdleTaskRunner;
+}
+
+namespace cc {
+
+class FakeImplThreadVerifier : public ThreadVerifier {
+ public:
+  FakeImplThreadVerifier()
+      : ThreadVerifier(base::ThreadTaskRunnerHandle::Get(), nullptr),
+        set_impl_thread_(this) {}
+
+  explicit FakeImplThreadVerifier(
+      scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner)
+      : ThreadVerifier(base::ThreadTaskRunnerHandle::Get(), impl_task_runner),
+        set_impl_thread_(this) {}
+
+ private:
+  DebugScopedSetImplThread set_impl_thread_;
+};
+
+}  // namespace cc
+#endif  // CC_TEST_FAKE_IMPL_THREAD_VERIFIER_H_