[SPv2] Paint invalidation in PreWalkTreeWalk, plumbed on PaintInvalidationState

third_party/WebKit/Source/core/paint/PaintInvalidator.h

Index: third_party/WebKit/Source/core/paint/PaintInvalidator.h
diff --git a/third_party/WebKit/Source/core/paint/PaintInvalidator.h b/third_party/WebKit/Source/core/paint/PaintInvalidator.h
new file mode 100644
index 0000000000000000000000000000000000000000..3edca170fe6c0d2e738f5bc8fa67987095ac91e3
--- /dev/null
+++ b/third_party/WebKit/Source/core/paint/PaintInvalidator.h
@@ -0,0 +1,37 @@
+// 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.
+
+#ifndef PaintInvalidator_h
+#define PaintInvalidator_h
+
+#include "core/layout/PaintInvalidationState.h"
+#include "wtf/Optional.h"
+#include "wtf/Vector.h"
+
+namespace blink {
+
+class FrameView;
+class LayoutObject;
+struct PaintPropertyTreeBuilderContext;
+
+// TODO(wangxianzhu): Move applicable PaintInvalidationState code into PaintInvalidator.
+using PaintInvalidatorContext = PaintInvalidationState;
+
+class PaintInvalidator {
+public:
+    // TODO(wangxianzhu): Avoid Optional<> by using copy-and-update pattern for PaintInvalidatorContext.
+    void invalidatePaintIfNeeded(FrameView&, const PaintPropertyTreeBuilderContext&, Optional<PaintInvalidatorContext>&);
+    void invalidatePaintIfNeeded(const LayoutObject&, const PaintPropertyTreeBuilderContext&, const PaintInvalidatorContext&, Optional<PaintInvalidatorContext>&);
+
+    // Process objects needing paint invalidation on the next frame.
+    // See the definition of PaintInvalidationDelayedFull for more details.
+    void processPendingDelayedPaintInvalidations();
+
+private:
+    Vector<const LayoutObject*> m_pendingDelayedPaintInvalidations;
+};
+
+} // namespace blink
+
+#endif // PaintInvalidator_h