Add drawImage() originClean() getSecurityOrigin() to OffscreenCanvas

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp

Index: third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp
diff --git a/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp b/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp
index 758318b868cfc03fdff88fcf6e793f1ef12ac287..e888741cafc687c86fe55d282bebbeada82d30eb 100644
--- a/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp
+++ b/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp
@@ -33,12 +33,12 @@ DEFINE_TRACE(OffscreenCanvasRenderingContext2D)
 // BaseRenderingContext2D implementation
 bool OffscreenCanvasRenderingContext2D::originClean() const
 {
-    return m_originClean;
+    return getOffscreenCanvas()->originClean();
 }
 
 void OffscreenCanvasRenderingContext2D::setOriginTainted()
 {
-    m_originClean = false;
+    return getOffscreenCanvas()->setOriginTainted();
 }
 
 bool OffscreenCanvasRenderingContext2D::wouldTaintOrigin(CanvasImageSource* source, ScriptState* scriptState)
@@ -91,6 +91,7 @@ ImageBitmap* OffscreenCanvasRenderingContext2D::transferToImageBitmap(ExceptionS
     // TODO: crbug.com/593514 Add support for GPU rendering
     RefPtr<SkImage> skImage = m_imageBuffer->newSkImageSnapshot(PreferNoAcceleration, SnapshotReasonUnknown);
     RefPtr<StaticBitmapImage> image = StaticBitmapImage::create(skImage.release());
+    image->setOriginClean(this->originClean());

[Justin Novosad, 2016/04/29 04:08:55]

This needs a test. Something like: draw a tainted ImageBitmap into an OCRC2D on
a worker, call tranferToImageBitmap, transfer the image bitmap back to the main
thread; draw it to a canvas; try to call getImageData().

     m_imageBuffer.clear(); // "Transfer" means no retained buffer
     return ImageBitmap::create(image.release());
 }