cc: When the transform's scale is unknown, draw render surfaces at the resolution of the screen.

cc/math_util.cc

Index: cc/math_util.cc
diff --git a/cc/math_util.cc b/cc/math_util.cc
index 46d1c278253a72a1d62bc9311a13952180768cf1..38b609b162698e2b3330e2bd3ca2a8f2c5eed1e7 100644
--- a/cc/math_util.cc
+++ b/cc/math_util.cc
@@ -383,10 +383,10 @@ static inline float scaleOnAxis(double a, double b, double c)
     return std::sqrt(a * a + b * b + c * c);
 }
 
-gfx::Vector2dF MathUtil::computeTransform2dScaleComponents(const gfx::Transform& transform)
+gfx::Vector2dF MathUtil::computeTransform2dScaleComponents(const gfx::Transform& transform, float fallbackValue)
 {
     if (transform.HasPerspective())
-        return gfx::Vector2dF(1, 1);
+        return gfx::Vector2dF(fallbackValue, fallbackValue);
     float xScale = scaleOnAxis(transform.matrix().getDouble(0, 0), transform.matrix().getDouble(1, 0), transform.matrix().getDouble(2, 0));
     float yScale = scaleOnAxis(transform.matrix().getDouble(0, 1), transform.matrix().getDouble(1, 1), transform.matrix().getDouble(2, 1));
     return gfx::Vector2dF(xScale, yScale);