Improve computation of ctmScale{X,Y} in NativeImageSkia::drawPattern

Source/platform/graphics/skia/NativeImageSkia.cpp

Index: Source/platform/graphics/skia/NativeImageSkia.cpp
diff --git a/Source/platform/graphics/skia/NativeImageSkia.cpp b/Source/platform/graphics/skia/NativeImageSkia.cpp
index f9ed9b6beb100e1c1dbb5323251aac4327af9e69..87133033551e0ef46d2deea75435487fbe9e6cbe 100644
--- a/Source/platform/graphics/skia/NativeImageSkia.cpp
+++ b/Source/platform/graphics/skia/NativeImageSkia.cpp
@@ -451,8 +451,9 @@ void NativeImageSkia::drawPattern(
         return; // nothing to draw
 
     SkMatrix totalMatrix = context->getTotalMatrix();
-    SkScalar ctmScaleX = totalMatrix.getScaleX();
-    SkScalar ctmScaleY = totalMatrix.getScaleY();
+    AffineTransform ctm = context->getCTM();
+    SkScalar ctmScaleX = ctm.xScale();
+    SkScalar ctmScaleY = ctm.yScale();
     totalMatrix.preScale(scale.width(), scale.height());
 
     // Figure out what size the bitmap will be in the destination. The