Don't cache subsequence whose layer is not fully contained by repaint rect

Source/core/paint/DisplayItemListPaintTest.h

 // Copyright 2015 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.
 
 #ifndef DisplayItemListPaintTest_h
 #define DisplayItemListPaintTest_h
 
 #include "core/frame/FrameView.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/LayoutView.h"
@@ skipping 34 matching lines @@
 class DisplayItemListPaintTestForSlimmingPaintV2 : public RenderingTest {
 public:
     DisplayItemListPaintTestForSlimmingPaintV2()
         : m_originalSlimmingPaintV2Enabled(RuntimeEnabledFeatures::slimmingPaintV2Enabled()) { }
 
 protected:
     LayoutView& layoutView() { return *document().layoutView(); }
     DisplayItemList& rootDisplayItemList() { return *layoutView().layer()->graphicsLayerBacking()->displayItemList(); }
 
     // Expose some document lifecycle steps for checking new display items before commiting.
-    void updateLifecyclePhasesToPaintForSlimmingPaintV2Clean()
+    void updateLifecyclePhasesToPaintForSlimmingPaintV2Clean(const LayoutRect& interestRect = LayoutRect::infiniteRect())
     {
         document().view()->updateLifecyclePhasesInternal(FrameView::OnlyUpToCompositingCleanPlusScrolling);
         document().view()->invalidateTreeIfNeededRecursive();
-        document().view()->paintForSlimmingPaintV2();
+        document().view()->paintForSlimmingPaintV2(interestRect);
     }
     void compositeForSlimmingPaintV2() { document().view()->compositeForSlimmingPaintV2(); }
 
 private:
     void SetUp() override
     {
         ASSERT_TRUE(RuntimeEnabledFeatures::slimmingPaintEnabled());
         RuntimeEnabledFeatures::setSlimmingPaintV2Enabled(true);
 
         RenderingTest::SetUp();
@@ skipping 49 matching lines @@
         TestDisplayItem(*layoutView().layer()->graphicsLayerBacking(), DisplayItem::drawingTypeToCachedDrawingType(DisplayItem::DebugRedFill)), \
         __VA_ARGS__)
 #else
 #define EXPECT_DISPLAY_LIST_WITH_RED_FILL_IN_DEBUG EXPECT_DISPLAY_LIST_BASE
 #define EXPECT_DISPLAY_LIST_WITH_CACHED_RED_FILL_IN_DEBUG EXPECT_DISPLAY_LIST_BASE
 #endif
 
 } // namespace blink
 
 #endif // DisplayItemListPaintTest_h