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

cc/layer_tree_host_impl.h

Index: cc/layer_tree_host_impl.h
diff --git a/cc/layer_tree_host_impl.h b/cc/layer_tree_host_impl.h
index 5337f19183355dbfc94ae37df5497bf82a81f749..a2739a7d58512efe7af3fb0767a04f03f5ef7a45 100644
--- a/cc/layer_tree_host_impl.h
+++ b/cc/layer_tree_host_impl.h
@@ -16,6 +16,7 @@
 #include "cc/render_pass_sink.h"
 #include "cc/renderer.h"
 #include "cc/tile_manager.h"
+#include "cc/top_controls_manager.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/rect.h"
 
@@ -31,6 +32,7 @@ class LayerTreeImpl;
 class PageScaleAnimation;
 class RenderPassDrawQuad;
 class ResourceProvider;
+class TopControlsManager;
 struct RendererCapabilities;
 struct RenderingStats;
 
@@ -113,7 +115,8 @@ private:
 class CC_EXPORT LayerTreeHostImpl : public InputHandlerClient,
                                     public RendererClient,
                                     public TileManagerClient,
-                                    public OutputSurfaceClient {
+                                    public OutputSurfaceClient,
+                                    public TopControlsDelegate {
     typedef std::vector<LayerImpl*> LayerList;
 
 public:
@@ -205,7 +208,7 @@ public:
 
     void readback(void* pixels, const gfx::Rect&);
 
-    LayerTreeImpl* activeTree() { return m_activeTree.get(); }
+    virtual LayerTreeImpl* activeTree() OVERRIDE;
     LayerTreeImpl* pendingTree() { return m_pendingTree.get(); }
 
     // TODO(nduca): Remove these in favor of LayerTreeImpl.
@@ -253,9 +256,9 @@ public:
     void setNeedsAnimateLayers() { m_needsAnimateLayers = true; }
 
     bool needsUpdateDrawProperties() const { return m_needsUpdateDrawProperties; }
-    void setNeedsUpdateDrawProperties() { m_needsUpdateDrawProperties = true; }
+    virtual void setNeedsUpdateDrawProperties() OVERRIDE;
 
-    void setNeedsRedraw();
+    virtual void setNeedsRedraw() OVERRIDE;
 
     void renderingStats(RenderingStats*) const;
 
@@ -379,6 +382,8 @@ private:
     bool m_pinchGestureActive;
     gfx::Point m_previousPinchAnchor;
 
+    scoped_ptr<TopControlsManager> m_topControlsManager;
+
     scoped_ptr<PageScaleAnimation> m_pageScaleAnimation;
 
     // This is used for ticking animations slowly when hidden.