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 847795f810fcc068f26afb6edc130650cfe0fa54..6a8cb07e2e3f2ca9962bf482c7f2b0012c977001 100644
--- a/cc/layer_tree_settings.h
+++ b/cc/layer_tree_settings.h
@@ -29,9 +29,11 @@ class CC_EXPORT LayerTreeSettings {
   bool showOverdrawInTracing;
   bool canUseLCDText;
   bool shouldClearRootRenderPass;
+  bool calculateTopControlsPosition;
   double refreshRate;
   size_t maxPartialTextureUpdates;
   size_t numRasterThreads;
+  size_t topControlsHeight;  // in pixels compensated for density

[jamesr, 2012/12/19 22:56:29]

in cc, integral pixel offsets are just 'int'

start comments with and uppercase letter and end with a period, or make the
value more apparent from the name. I've no idea what "compensated for density"
is supposed to mean.

[Ted C, 2012/12/20 00:42:39]

Done.  Just renamed with the suffix Px, which is at least in android a common
means of specifying true screen pixels.  If that's not common or just simply
implied by sizes here, then I can remove that.

   gfx::Size defaultTileSize;
   gfx::Size maxUntiledLayerSize;
   gfx::Size minimumOcclusionTrackingSize;