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

cc/CCMathUtil.cpp

Index: cc/CCMathUtil.cpp
diff --git a/cc/CCMathUtil.cpp b/cc/CCMathUtil.cpp
index d90eb090abef6fbc004f87cedc0a3188419486cf..6377f645f9cb0ad99f547524b342425f21f3a779 100644
--- a/cc/CCMathUtil.cpp
+++ b/cc/CCMathUtil.cpp
@@ -361,6 +361,13 @@ void CCMathUtil::flattenTransformTo2d(WebTransformationMatrix& transform)
     transform.setM43(0);
 }
 
+FloatPoint CCMathUtil::computeTransform2dScaleComponents(const WebTransformationMatrix& transform)
+{
+    FloatPoint3D xAxis(transform.m11(), transform.m12(), transform.m13());
+    FloatPoint3D yAxis(transform.m21(), transform.m22(), transform.m23());
+    return FloatPoint(xAxis.distanceTo(FloatPoint3D()), yAxis.distanceTo(FloatPoint3D()));
+}
+
 float CCMathUtil::smallestAngleBetweenVectors(const FloatSize& v1, const FloatSize& v2)
 {
     float dotProduct = (v1.width() * v2.width() + v1.height() * v2.height()) / (v1.diagonalLength() * v2.diagonalLength());