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 375cbf6f8fc6782f1bcc4da5018401226edf4c0f..76aa4633964875039d74a20f24dfbf00f036ae1e 100644
--- a/cc/layer_tree_settings.h
+++ b/cc/layer_tree_settings.h
@@ -30,11 +30,13 @@ class CC_EXPORT LayerTreeSettings {
   bool canUseLCDText;
   bool shouldClearRootRenderPass;
   bool useLinearFadeScrollbarAnimator;
+  bool calculateTopControlsPosition;
   float minimumContentsScale;
   float lowResContentsScaleFactor;
   double refreshRate;
   size_t maxPartialTextureUpdates;
   size_t numRasterThreads;
+  int topControlsHeightPx;
   gfx::Size defaultTileSize;
   gfx::Size maxUntiledLayerSize;
   gfx::Size minimumOcclusionTrackingSize;