[SPv2] Defer decision of raster invalidation after paint for changes z-index, transform, etc.

third_party/WebKit/Source/platform/graphics/paint/PaintChunk.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 PaintChunk_h
 #define PaintChunk_h
 
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/paint/DisplayItem.h"
 #include "platform/graphics/paint/PaintChunkProperties.h"
 #include "wtf/Allocator.h"
 #include "wtf/Optional.h"
+#include "wtf/Vector.h"
 #include <iosfwd>
 
 namespace blink {
 
 // A contiguous sequence of drawings with common paint properties.
 //
 // This is expected to be owned by the paint artifact which also owns the
 // related drawings.
 //
 // This is a Slimming Paint v2 class.
@@ skipping 71 matching lines @@
         && a.bounds == b.bounds
         && a.knownToBeOpaque == b.knownToBeOpaque
         && a.rasterInvalidationRects == b.rasterInvalidationRects;
 }
 
 inline bool operator!=(const PaintChunk& a, const PaintChunk& b)
 {
     return !(a == b);
 }
 
+inline bool chunkLessThanIndex(const PaintChunk& chunk, size_t index)
+{
+    return chunk.endIndex <= index;
+}
+
+inline Vector<PaintChunk>::iterator findChunkInVectorByDisplayItemIndex(Vector<PaintChunk>& chunks, size_t index)
+{
+    auto chunk = std::lower_bound(chunks.begin(), chunks.end(), index, chunkLessThanIndex);
+    DCHECK(chunk == chunks.end() || (index >= chunk->beginIndex && index < chunk->endIndex));
+    return chunk;
+}
+
+inline Vector<PaintChunk>::const_iterator findChunkInVectorByDisplayItemIndex(const Vector<PaintChunk>& chunks, size_t index)
+{
+    return findChunkInVectorByDisplayItemIndex(const_cast<Vector<PaintChunk>&>(chunks), index);
+}
+
 // Redeclared here to avoid ODR issues.
 // See platform/testing/PaintPrinters.h.
 void PrintTo(const PaintChunk&, std::ostream*);
 
 } // namespace blink
 
 #endif // PaintChunk_h