Support currentTransform in 2D Canvas.

Source/core/html/canvas/CanvasRenderingContext2D.cpp

Index: Source/core/html/canvas/CanvasRenderingContext2D.cpp
diff --git a/Source/core/html/canvas/CanvasRenderingContext2D.cpp b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
index 3225ecd6344fed465e421df94628b5dea72dc844..52d0108691080c800ae1bc8835327c49a770d3a4 100644
--- a/Source/core/html/canvas/CanvasRenderingContext2D.cpp
+++ b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
@@ -596,6 +596,11 @@ void CanvasRenderingContext2D::setGlobalCompositeOperation(const String& operati
     c->setCompositeOperation(op, blendMode);
 }
 
+void CanvasRenderingContext2D::setCurrentTransform(const SVGMatrix& currentTransform)
+{
+    setTransform(currentTransform.a(), currentTransform.b(), currentTransform.c(), currentTransform.d(), currentTransform.e(), currentTransform.f());
+}
+
 void CanvasRenderingContext2D::scale(float sx, float sy)
 {
     GraphicsContext* c = drawingContext();
@@ -698,12 +703,12 @@ void CanvasRenderingContext2D::transform(float m11, float m12, float m21, float
 
     realizeSaves();
 
+    modifiableState().m_transform = newTransform;
     if (!newTransform.isInvertible()) {
         modifiableState().m_invertibleCTM = false;
         return;
     }
 
-    modifiableState().m_transform = newTransform;
     c->concatCTM(transform);
     m_path.transform(transform.inverse());
 }