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

cc/layer_tree_settings.h

 // Copyright 2011 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_LAYER_TREE_SETTINGS_H_
 #define CC_LAYER_TREE_SETTINGS_H_
 
 #include "base/basictypes.h"
 #include "cc/cc_export.h"
 #include "cc/layer_tree_debug_state.h"
@@ skipping 11 matching lines @@
   bool implSidePainting;
   bool renderVSyncEnabled;
   bool perTilePaintingEnabled;
   bool partialSwapEnabled;
   bool acceleratedAnimationEnabled;
   bool pageScalePinchZoomEnabled;
   bool backgroundColorInsteadOfCheckerboard;
   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;
 
   LayerTreeDebugState initialDebugState;
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYER_TREE_SETTINGS_H_