Only create PaintChunks at drawing and foreignLayer boundaries

third_party/WebKit/Source/core/paint/PaintControllerPaintTest.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/PaintControllerPaintTest.h"
 
 #include "core/editing/FrameCaret.h"
 #include "core/editing/FrameSelection.h"
 #include "core/layout/LayoutText.h"
 #include "core/layout/line/InlineTextBox.h"
@@ skipping 217 matching lines @@
   }
 
   // Verify that the background does not scroll.
   const PaintChunk& backgroundChunk = rootPaintController().paintChunks()[0];
   EXPECT_FALSE(backgroundChunk.properties.propertyTreeState.transform()
                    ->isScrollTranslation());
 
   const EffectPaintPropertyNode* effectNode = div.paintProperties()->effect();
   EXPECT_EQ(0.5f, effectNode->opacity());
 
-  // When RLS is enabled, an additional paint chunk will be created for the
-  // LayoutView's layer.
-  unsigned divChunkIndex =
-      RuntimeEnabledFeatures::rootLayerScrollingEnabled() ? 2 : 1;
-  const PaintChunk& chunk = rootPaintController().paintChunks()[divChunkIndex];
+  const PaintChunk& chunk = rootPaintController().paintChunks()[1 /* div */];
   EXPECT_EQ(*div.layer(), chunk.id->client);
   EXPECT_EQ(effectNode, chunk.properties.propertyTreeState.effect());
 
   EXPECT_FALSE(div.layer()->isJustCreated());
   // Client used by only paint chunks and non-cachaeable display items but not
   // by any cacheable display items won't be marked as validly cached.
   EXPECT_FALSE(rootPaintController().clientCacheIsValid(*div.layer()));
   EXPECT_FALSE(rootPaintController().clientCacheIsValid(div));
   EXPECT_TRUE(rootPaintController().clientCacheIsValid(subDiv));
 }
@@ skipping 34 matching lines @@
         TestDisplayItem(div, DisplayItem::kEndCompositing),
         TestDisplayItem(htmlLayer, DisplayItem::kEndSubsequence),
         TestDisplayItem(*layoutView().layer(), DisplayItem::kEndSubsequence),
         TestDisplayItem(layoutView(),
                         DisplayItem::clipTypeToEndClipType(
                             DisplayItem::kClipFrameToVisibleContentRect)));
   }
 }
 
 }  // namespace blink