cc: Pass LayerTreeHostImpl to LayerImpl constructor

cc/test/fake_impl_proxy.h

Index: cc/test/fake_impl_proxy.h
diff --git a/cc/test/fake_impl_proxy.h b/cc/test/fake_impl_proxy.h
new file mode 100644
index 0000000000000000000000000000000000000000..afabcc1b6323ea69b5e1301f9812a0700056fb54
--- /dev/null
+++ b/cc/test/fake_impl_proxy.h
@@ -0,0 +1,27 @@
+// Copyright 2012 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_PROXY_H_
+#define CC_TEST_FAKE_IMPL_PROXY_H_
+
+#include "cc/single_thread_proxy.h"
+#include "cc/test/fake_proxy.h"
+
+namespace cc {
+
+class FakeImplProxy : public FakeProxy {
+ public:
+   FakeImplProxy()
+       : FakeProxy(scoped_ptr<Thread>()),
+         set_impl_thread_(this)
+   {
+   }
+
+ private:
+  DebugScopedSetImplThread set_impl_thread_;
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_FAKE_IMPL_PROXY_H_