Add a hack to set shouldPaint to true for force-composited iframes.

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

 // Copyright 2014 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/BlockFlowPainter.h"
 
 #include "core/layout/FloatingObjects.h"
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/paint/BlockPainter.h"
 #include "core/paint/LineBoxListPainter.h"
@@ skipping 28 matching lines @@
     ASSERT(paintInfo.phase == PaintPhaseFloat || paintInfo.phase == PaintPhaseSelection || paintInfo.phase == PaintPhaseTextClip);
     PaintInfo floatPaintInfo(paintInfo);
     if (paintInfo.phase == PaintPhaseFloat)
         floatPaintInfo.phase = PaintPhaseForeground;
 
     for (const auto& floatingObject : m_layoutBlockFlow.floatingObjects()->set()) {
         if (!floatingObject->shouldPaint())
             continue;
 
         const LayoutBox* floatingLayoutObject = floatingObject->layoutObject();
-        if (floatingLayoutObject->hasSelfPaintingLayer())
-            continue;
-
         // FIXME: LayoutPoint version of xPositionForFloatIncludingMargin would make this much cleaner.
         LayoutPoint childPoint = m_layoutBlockFlow.flipFloatForWritingModeForChild(
             *floatingObject, LayoutPoint(paintOffset.x()
             + m_layoutBlockFlow.xPositionForFloatIncludingMargin(*floatingObject) - floatingLayoutObject->location().x(), paintOffset.y()
             + m_layoutBlockFlow.yPositionForFloatIncludingMargin(*floatingObject) - floatingLayoutObject->location().y()));
         ObjectPainter(*floatingLayoutObject).paintAllPhasesAtomically(floatPaintInfo, childPoint);
     }
 }
 
 } // namespace blink