Add support for calculating the position of the top controls in the cc layer.

cc/top_controls_manager_client.h

Index: cc/top_controls_manager_client.h
diff --git a/cc/top_controls_manager_client.h b/cc/top_controls_manager_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..e1111ed74a52debfa5daa384ea6accfe857292ee
--- /dev/null
+++ b/cc/top_controls_manager_client.h
@@ -0,0 +1,24 @@
+// 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_TOP_CONTROLS_MANAGER_CLIENT_H_
+#define CC_TOP_CONTROLS_MANAGER_CLIENT_H_
+
+namespace cc {
+
+class LayerTreeImpl;
+
+class TopControlsManagerClient {
+ public:
+  virtual void setNeedsRedraw() = 0;
+  virtual void setNeedsUpdateDrawProperties() = 0;
+  virtual LayerTreeImpl* activeTree() = 0;
+
+ protected:
+  virtual ~TopControlsManagerClient() {}
+};
+
+}  // namespace cc
+
+#endif  // CC_TOP_CONTROLS_MANAGER_CLIENT_H_