Disable paint invalidatin optimization about SVG transform change

Source/core/rendering/svg/RenderSVGModelObject.cpp

Index: Source/core/rendering/svg/RenderSVGModelObject.cpp
diff --git a/Source/core/rendering/svg/RenderSVGModelObject.cpp b/Source/core/rendering/svg/RenderSVGModelObject.cpp
index b8d334f0a12725838e2afad717df5df663f1cad5..bfa362841d2fbcf6beecda316864413f24c31b79 100644
--- a/Source/core/rendering/svg/RenderSVGModelObject.cpp
+++ b/Source/core/rendering/svg/RenderSVGModelObject.cpp
@@ -149,14 +149,6 @@ void RenderSVGModelObject::invalidatePaintIfNeeded(const PaintInvalidationState&
     setPreviousPaintInvalidationRect(boundsRectForPaintInvalidation(&paintInvalidationState.paintInvalidationContainer(), &paintInvalidationState));
     setPreviousPositionFromPaintInvalidationContainer(RenderLayer::positionFromPaintInvalidationContainer(this, &paintInvalidationState.paintInvalidationContainer(), &paintInvalidationState));
 
-    // If an ancestor container had its transform changed, then we just
-    // need to update the RenderSVGModelObject's repaint rect above. The invalidation
-    // will be handled by the container where the transform changed. This essentially
-    // means that we prune the entire branch for performance.
-    RenderObject* parent = this->parent();
-    if (parent && parent->isSVGContainer() && toRenderSVGContainer(parent)->didTransformToRootUpdate())
-        return;

[Julien - ping for review, 2014/07/28 18:05:27]

Actually, we should re-enable the ASSERT in RenderObject for SVG sub-trees in
RenderObject::assertSubtreeClearedPaintInvalidationState.

[Xianzhu, 2014/07/28 20:09:37]

Done.

-
     // If we are set to do a full paint invalidation that means the RenderView will be
     // issue paint invalidations. We can then skip issuing of paint invalidations for the child
     // renderers as they'll be covered by the RenderView.