Chromium compositor change implementing page-scale driven pinch-zoom.

cc/CCSettings.h

 // Copyright 2012 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 CCSettings_h
 #define CCSettings_h
 
 #include "IntSize.h"
 
 namespace cc {
 
 // This file is for settings that apply to all compositors.  Add settings to
 // CCLayerTreeSettings if a ui and renderer compositor might not want the same
 // setting.
 
 class CCSettings {
 public:
     static bool perTilePaintingEnabled();
     static bool partialSwapEnabled();
     static bool acceleratedAnimationEnabled();
+    static bool pageScalePinchZoomEnabled();
 
     static bool jankInsteadOfCheckerboard();
     static bool backgroundColorInsteadOfCheckerboard();
 
     // These setters should only be used on the main thread before the layer
     // renderer is initialized.
     static void setPerTilePaintingEnabled(bool);
     static void setPartialSwapEnabled(bool);
     static void setAcceleratedAnimationEnabled(bool);
+    static void setPageScalePinchZoomEnabled(bool);
 
     // These settings are meant to be set only once, and only read thereafter.
     // This function is only for resetting settings in tests.
     static void reset();
 };
 
 } // namespace cc
 
 #endif // CCSettings_h