Apply SVG viewport clips in PaintLayer; paint background of replaced like boxes.

third_party/WebKit/Source/core/paint/PaintLayerClipperTest.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/PaintLayerClipper.h"
 
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/LayoutView.h"
 #include "core/paint/PaintLayer.h"
@@ skipping 32 matching lines @@
   ClipRectsContext context(document().layoutView()->layer(), UncachedClipRects);
   // When RLS is enabled, the LayoutView will have a composited scrolling layer,
   // so don't apply an overflow clip.
   if (RuntimeEnabledFeatures::rootLayerScrollingEnabled())
     context.setIgnoreOverflowClip();
   LayoutRect layerBounds;
   ClipRect backgroundRect, foregroundRect;
   targetPaintLayer->clipper().calculateRects(
       context, LayoutRect(LayoutRect::infiniteIntRect()), layerBounds,
       backgroundRect, foregroundRect);
-  EXPECT_EQ(LayoutRect(LayoutRect::infiniteIntRect()), backgroundRect.rect());
-  // TODO(chrishtr): the behavior for SPv2 is actually correct, since the
-  // svg root clip should be applied to the foreground rect. See
-  // crbug.com/680325.
-  if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled())
-    EXPECT_EQ(LayoutRect(LayoutRect::infiniteIntRect()), foregroundRect.rect());
+  EXPECT_EQ(LayoutRect(8, 8, 200, 300), backgroundRect.rect());
+  EXPECT_EQ(LayoutRect(8, 8, 200, 300), foregroundRect.rect());
   EXPECT_EQ(LayoutRect(8, 8, 200, 300), layerBounds);
 }
 
 TEST_P(PaintLayerClipperTest, LayoutSVGRootChild) {
   setBodyInnerHTML(
       "<svg width=200 height=300 style='position: relative'>"
       "  <foreignObject width=400 height=500>"
       "    <div id=target xmlns='http://www.w3.org/1999/xhtml' "
       "style='position: relative'></div>"
       "  </foreignObject>"
@@ skipping 191 matching lines @@
 
   parent->clipper().clearClipRectsIncludingDescendants(AbsoluteClipRects);
 
   EXPECT_TRUE(parent->clipRectsCache());
   EXPECT_TRUE(child->clipRectsCache());
   EXPECT_FALSE(parent->clipRectsCache()->get(AbsoluteClipRects).root);
   EXPECT_FALSE(parent->clipRectsCache()->get(AbsoluteClipRects).root);
 }
 
 }  // namespace blink