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

cc/layer_tree_settings.h

Index: cc/layer_tree_settings.h
diff --git a/cc/layer_tree_settings.h b/cc/layer_tree_settings.h
index 6f0f7bebc5a572dcd90487d87255a40ff2e9c742..7026c6804c2b4ab31e2c6844ac4de5480a141fa2 100644
--- a/cc/layer_tree_settings.h
+++ b/cc/layer_tree_settings.h
@@ -30,9 +30,11 @@ class CC_EXPORT LayerTreeSettings {
   bool canUseLCDText;
   bool shouldClearRootRenderPass;
   bool useLinearFadeScrollbarAnimator;
+  bool calculateTopControlsPosition;
   double refreshRate;
   size_t maxPartialTextureUpdates;
   size_t numRasterThreads;
+  int topControlsHeightPx;
   gfx::Size defaultTileSize;
   gfx::Size maxUntiledLayerSize;
   gfx::Size minimumOcclusionTrackingSize;