Implement origin-clean algorithm for ImageBitmap.

This resolves #973.

1 files changed, 5 insertions, 0 deletions

diff --git a/dom/canvas/ImageBitmapRenderingContext.cpp b/dom/canvas/ImageBitmapRenderingContext.cpp
index 8f50745542..ad313906a3 100644
--- a/dom/canvas/ImageBitmapRenderingContext.cpp
+++ b/dom/canvas/ImageBitmapRenderingContext.cpp
@@ -63,6 +63,11 @@ ImageBitmapRenderingContext::TransferFromImageBitmap(ImageBitmap& aImageBitmap)
   if (!mImage) {
     return;
   }
+  
+  // Check if ImageBitmap is tainted, and if so flag the canvas tainted too.
+  if (aImageBitmap.IsWriteOnly() && mCanvasElement) {
+    mCanvasElement->SetWriteOnly();
+  }
 
   Redraw(gfxRect(0, 0, mWidth, mHeight));
 }