Add a origin clean flag in ImageBitmap class

third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage.html

Index: third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage.html
diff --git a/third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage.html b/third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage.html
index 6442e2af769a9d946651e862edde75307b86fabd..cd81dcf960b8831b6b4292efaaa82ac67a500b1a 100644
--- a/third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage.html
+++ b/third_party/WebKit/LayoutTests/fast/canvas/canvas-createImageBitmap-drawImage.html
@@ -154,7 +154,6 @@ function loaded() {
     if (imageLoaded && imageBitmapLoaded && blobLoaded) {
         // check all of these elements
         elements = [image, aCanvas, d, testBitmap, blob];
-
         // wait for callback to finish before each check to ensure synchronous behavior
         nextCheck(0);
     }