When setting needsRepaint, don't stop at non-stacking composited PaintLayers.

third_party/WebKit/Source/core/paint/PaintLayerTest.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/PaintLayer.h"
 
 #include "core/html/HTMLIFrameElement.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/LayoutView.h"
@@ skipping 480 matching lines @@
   EXPECT_EQ(LayoutRect(0, 30, 50, 10), contentLayer->visualRect());
   EXPECT_EQ(LayoutRect(0, 30, 50, 5), content->visualRect());
 
   scroller->getScrollableArea()->setScrollOffset(ScrollOffset(0, 20),
                                                  ProgrammaticScroll);
   document().view()->updateAllLifecyclePhases();
   EXPECT_EQ(LayoutRect(0, 30, 50, 10), contentLayer->visualRect());
   EXPECT_EQ(LayoutRect(0, 30, 50, 5), content->visualRect());
 }
 
+TEST_P(PaintLayerTest, CompositingContainerFloat) {
+  enableCompositing();
+  setBodyInnerHTML(
+      "<div id='containingBlock' style='position: relative; z-index: 0'>"
+      "<div style='backface-visibility: hidden'></div>"

[Xianzhu, 2017/01/07 01:04:46]

Nit: indent line 505-508 by 2 spaces after '"'.

[chrishtr, 2017/01/07 01:15:00]

Fixed.

+      "<span style='clip-path: polygon(0px 15px, 0px 54px, 100px 0px)'>"
+      "  <div id='target' style='float: right; position: relative'></div>"
+      "</span>"
+      "</html>");

[Xianzhu, 2017/01/07 01:04:46]

Nit: s/html/div/

[chrishtr, 2017/01/07 01:15:00]

Fixed.

+
+  PaintLayer* target =
+      toLayoutBoxModelObject(getLayoutObjectByElementId("target"))->layer();
+  PaintLayer* containingBlock =
+      toLayoutBoxModelObject(getLayoutObjectByElementId("containingBlock"))
+          ->layer();
+  EXPECT_EQ(containingBlock, target->compositingContainer());
+}
+
 }  // namespace blink