Support currentTransform in 2D Canvas.

Source/bindings/v8/custom/V8CanvasRenderingContext2DCustom.cpp

Index: Source/bindings/v8/custom/V8CanvasRenderingContext2DCustom.cpp
diff --git a/Source/bindings/v8/custom/V8CanvasRenderingContext2DCustom.cpp b/Source/bindings/v8/custom/V8CanvasRenderingContext2DCustom.cpp
index 9a6325f288a96b537bd6e7d04005c4904c064fe1..282361e5942453c5b51d1f6250e88adb55dc657c 100644
--- a/Source/bindings/v8/custom/V8CanvasRenderingContext2DCustom.cpp
+++ b/Source/bindings/v8/custom/V8CanvasRenderingContext2DCustom.cpp
@@ -37,6 +37,7 @@
 #include "V8HTMLImageElement.h"
 #include "V8HTMLVideoElement.h"
 #include "V8ImageData.h"
+#include "bindings/V8SVGMatrix.h"
 #include "bindings/v8/V8Binding.h"
 #include "core/html/canvas/CanvasGradient.h"
 #include "core/html/canvas/CanvasPattern.h"
@@ -68,6 +69,23 @@ static PassRefPtr<CanvasStyle> toCanvasStyle(v8::Handle<v8::Value> value, v8::Is
     return 0;
 }
 
+void V8CanvasRenderingContext2D::currentTransformAttributeGetterCustom(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    CanvasRenderingContext2D* imp = V8CanvasRenderingContext2D::toNative(info.Holder());
+    v8SetReturnValue(info, toV8(SVGPropertyTearOff<SVGMatrix>::create(imp->currentTransform()), info.Holder(), info.GetIsolate()));
+}
+
+void V8CanvasRenderingContext2D::currentTransformAttributeSetterCustom(v8::Local<v8::String> name, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<void>& info)
+{
+    CanvasRenderingContext2D* imp = V8CanvasRenderingContext2D::toNative(info.Holder());
+    V8TRYCATCH_VOID(RefPtr<SVGPropertyTearOff<SVGMatrix> >, v, V8SVGMatrix::HasInstance(value, info.GetIsolate(), worldType(info.GetIsolate())) ? V8SVGMatrix::toNative(v8::Handle<v8::Object>::Cast(value)) : 0);
+    if (!v) {
+        throwTypeError(info.GetIsolate());
+        return;
+    }
+    imp->setCurrentTransform(WTF::getPtr(v)->propertyReference());
+}
+
 void V8CanvasRenderingContext2D::strokeStyleAttributeGetterCustom(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     CanvasRenderingContext2D* impl = V8CanvasRenderingContext2D::toNative(info.Holder());