Remove 2 calls to paintInvalidationForWholeRenderer

Source/core/rendering/RenderBox.cpp

Index: Source/core/rendering/RenderBox.cpp
diff --git a/Source/core/rendering/RenderBox.cpp b/Source/core/rendering/RenderBox.cpp
index a1818843d5d13a12457fe054184675abffca7163..4bd4dc35083b7e0430dad50aa39cd448ca605f80 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -142,12 +142,7 @@ void RenderBox::styleWillChange(StyleDifference diff, const RenderStyle& newStyl
 {
     RenderStyle* oldStyle = style();
     if (oldStyle) {
-        // The background of the root element or the body element could propagate up to
-        // the canvas.  Just dirty the entire canvas when our style changes substantially.
-        if ((diff.needsRepaint() || diff.needsLayout()) && node()
-            && (isHTMLHtmlElement(*node()) || isHTMLBodyElement(*node()))) {
-            view()->paintInvalidationForWholeRenderer();
-
+        if ((diff.needsRepaint() || diff.needsLayout()) && backgroundCanBleedToCanvas()) {
             if (oldStyle->hasEntirelyFixedBackground() != newStyle.hasEntirelyFixedBackground())
                 view()->compositor()->setNeedsUpdateFixedBackground();
         }
@@ -163,10 +158,6 @@ void RenderBox::styleWillChange(StyleDifference diff, const RenderStyle& newStyl
             if (isFloating() && !isOutOfFlowPositioned() && newStyle.hasOutOfFlowPosition())
                 removeFloatingOrPositionedChildFromBlockLists();
         }
-    // FIXME: This branch runs when !oldStyle, which means that layout was never called
-    // so what's the point in invalidating the whole view that we never painted?
-    } else if (isBody()) {
-        view()->paintInvalidationForWholeRenderer();
     }
 
     RenderBoxModelObject::styleWillChange(diff, newStyle);
@@ -1961,6 +1952,13 @@ LayoutRect RenderBox::clippedOverflowRectForPaintInvalidation(const RenderLayerM
     if (style()->visibility() != VISIBLE && enclosingLayer()->subtreeIsInvisible())
         return LayoutRect();
 
+    // If we have a background that could bleed into the canvas, just return
+    // the viewport's rectangle. This works as only body and the document
+    // element's renderer can bleed into the viewport so we are guaranteed
+    // to be in the RenderView's coordinate space.
+    if (style()->hasBackground() && backgroundCanBleedToCanvas())
+        return view()->viewRect();
+
     LayoutRect r = visualOverflowRect();
     mapRectToPaintInvalidationBacking(paintInvalidationContainer, r, false /*fixed*/, paintInvalidationState);
     return r;