Incorrect LocalFrame::paintIntoDragImage picture bounds

LocalFrame::paintIntoDragImage() translates the content to be origin-
aligned, but leaves the picture bounds unchanged => the picture content
lies outside the declared picture cull rect.

We need to also shift the picture bounds, to keep them aligned with its
content.

R=junov@chromium.org,mtklein@chromium.org
BUG=522143

Review URL: https://codereview.chromium.org/1303453003

git-svn-id: svn://svn.chromium.org/blink/trunk@200763 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/frame/LocalFrame.cpp

@@ -598,7 +598,10 @@ PassOwnPtr<DragImage> LocalFrame::paintIntoDragImage(
     paintingRect.setWidth(paintingRect.width() * deviceScaleFactor);
     paintingRect.setHeight(paintingRect.height() * deviceScaleFactor);
 
-    SkPictureBuilder pictureBuilder(paintingRect);
+    // The content is shifted to origin, to fit within the image bounds - which are the same
+    // as the picture bounds.
+    SkRect pictureBounds = SkRect::MakeIWH(paintingRect.width(), paintingRect.height());
+    SkPictureBuilder pictureBuilder(pictureBounds);
     {
         GraphicsContext& paintContext = pictureBuilder.context();