Bug 591358 - Report canvas element allocation sizes to the GC. r=gal

content/canvas/src/nsCanvasRenderingContext2D.cpp

@@ -1119,6 +1119,7 @@ nsCanvasRenderingContext2D::SetDimensions(PRInt32 width, PRInt32 height)
         }
 
         gCanvasMemoryUsed += width * height * 4;
+        JS_updateMallocCounter(nsContentUtils::GetCurrentJSContext(), width * height * 4);
     }
 
     return InitializeWithSurface(NULL, surface, width, height);