Canvas2d: Fix a bug to update incorrect rect bounds for accessibility.

Source/modules/canvas2d/CanvasRenderingContext2D.cpp

Index: Source/modules/canvas2d/CanvasRenderingContext2D.cpp
diff --git a/Source/modules/canvas2d/CanvasRenderingContext2D.cpp b/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
index a778072ae53ebbcf38871f0ecf498a2de374baf2..c3a244dd0450a69d35cf42a8d8bd843fde55f775 100644
--- a/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
+++ b/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
@@ -2179,6 +2179,7 @@ void CanvasRenderingContext2D::updateElementAccessibility(const Path& path, Elem
     transformedPath.transform(state().transform());
 
     // Offset by the canvas rect, taking border and padding into account.
+    element->document().updateLayoutIgnorePendingStylesheets();

[Justin Novosad, 2015/07/27 14:36:36]

You should to do this update update before calling canvas()->layoutObject().
OTherwise, the early return above may exit in cases where it should not.

[zino, 2015/07/28 00:38:48]

Done.

     IntRect canvasRect = renderer->absoluteBoundingBoxRect();
     canvasRect.move(lbmo->borderLeft() + lbmo->paddingLeft(), lbmo->borderTop() + lbmo->paddingTop());
     LayoutRect elementRect = enclosingLayoutRect(transformedPath.boundingRect());