Support currentTransform in 2D Canvas.

Source/core/html/canvas/CanvasRenderingContext2D.idl

Index: Source/core/html/canvas/CanvasRenderingContext2D.idl
diff --git a/Source/core/html/canvas/CanvasRenderingContext2D.idl b/Source/core/html/canvas/CanvasRenderingContext2D.idl
index 69a3ffa2354126397273daa1ad0936f1b3312e3b..1dd3c6e9c4d8aff8af03cd4ff12386377561d954 100644
--- a/Source/core/html/canvas/CanvasRenderingContext2D.idl
+++ b/Source/core/html/canvas/CanvasRenderingContext2D.idl
@@ -30,6 +30,7 @@ interface CanvasRenderingContext2D : CanvasRenderingContext {
     void save();
     void restore();
 
+    [EnabledAtRuntime=ExperimentalCanvasFeatures, Custom] attribute SVGMatrix currentTransform;

[haraken, 2013/09/20 07:07:19]

What code is generated if you omit [Custom]? How is the generated code different
from the custom binding code you wrote?

I think you need to search "TearOff" in code_generator_v8.pm and tweak the code
around it, so that the generator can generate the exact code you want.

     void scale(float sx, float sy);
     void rotate(float angle);
     void translate(float tx, float ty);