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

cc/CCMathUtil.cpp

 // 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.
 
 #include "config.h"
 
 #include "CCMathUtil.h"
 
 #include "FloatPoint.h"
 #include "FloatQuad.h"
 #include "IntRect.h"
+#include <math.h>
 #include <public/WebTransformationMatrix.h>
 
 using WebKit::WebTransformationMatrix;
 
 namespace cc {
 
 static HomogeneousCoordinate projectHomogeneousPoint(const WebTransformationMatrix& transform, const FloatPoint& p)
 {
     // In this case, the layer we are trying to project onto is perpendicular to ray
     // (point p and z-axis direction) that we are trying to project. This happens when the
@@ skipping 347 matching lines @@
     return rad2deg(acosf(dotProduct));
 }
 
 FloatSize CCMathUtil::projectVector(const FloatSize& source, const FloatSize& destination)
 {
     float sourceDotDestination = source.width() * destination.width() + source.height() * destination.height();
     float projectedLength = sourceDotDestination / destination.diagonalLengthSquared();
     return FloatSize(projectedLength * destination.width(), projectedLength * destination.height());
 }
 
+float CCMathUtil::distanceBetweenPoints(const FloatPoint& p1, const FloatPoint& p2)
+{
+    return sqrtf((p1.x() - p2.x()) * (p1.x() - p2.x()) + (p1.y() - p2.y()) * (p1.y() - p2.y()));
+}
+
 } // namespace cc