cc: Apply the layer's initial CSS scale to the contentsScale to render text at the right resolution.

cc/math_util.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 CCMathUtil_h
 #define CCMathUtil_h
 
 #include "FloatPoint.h"
 #include "FloatPoint3D.h"
 
@@ skipping 76 matching lines @@
     // NOTE: These functions do not do correct clipping against w = 0 plane, but they
     // correctly detect the clipped condition via the boolean clipped.
     static FloatQuad mapQuad(const WebKit::WebTransformationMatrix&, const FloatQuad&, bool& clipped);
     static FloatPoint mapPoint(const WebKit::WebTransformationMatrix&, const FloatPoint&, bool& clipped);
     static FloatPoint3D mapPoint(const WebKit::WebTransformationMatrix&, const FloatPoint3D&, bool& clipped);
     static FloatQuad projectQuad(const WebKit::WebTransformationMatrix&, const FloatQuad&, bool& clipped);
     static FloatPoint projectPoint(const WebKit::WebTransformationMatrix&, const FloatPoint&, bool& clipped);
 
     static void flattenTransformTo2d(WebKit::WebTransformationMatrix&);
 
+    static FloatPoint computeTransform2dScaleComponents(const WebKit::WebTransformationMatrix&);
+
     // Returns the smallest angle between the given two vectors in degrees. Neither vector is
     // assumed to be normalized.
     static float smallestAngleBetweenVectors(const FloatSize&, const FloatSize&);
 
     // Projects the |source| vector onto |destination|. Neither vector is assumed to be normalized.
     static FloatSize projectVector(const FloatSize& source, const FloatSize& destination);
 };
 
 } // namespace cc
 
 #endif // #define CCMathUtil_h