First step of PaintInvalidator implementation

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

Index: third_party/WebKit/Source/core/paint/BlockFlowPaintInvalidator.h
diff --git a/third_party/WebKit/Source/core/paint/BlockFlowPaintInvalidator.h b/third_party/WebKit/Source/core/paint/BlockFlowPaintInvalidator.h
new file mode 100644
index 0000000000000000000000000000000000000000..960ec0187a194a85f0093bd45bd2da0cd9cd0553
--- /dev/null
+++ b/third_party/WebKit/Source/core/paint/BlockFlowPaintInvalidator.h
@@ -0,0 +1,31 @@
+// 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 BlockFlowPaintInvalidator_h
+#define BlockFlowPaintInvalidator_h
+
+#include "platform/graphics/PaintInvalidationReason.h"
+#include "wtf/Allocator.h"
+
+namespace blink {
+
+class LayoutBlockFlow;
+struct PaintInvalidatorContext;
+
+class BlockFlowPaintInvalidator {
+    STACK_ALLOCATED();
+public:
+    BlockFlowPaintInvalidator(const LayoutBlockFlow& blockFlow, const PaintInvalidatorContext& context)
+        : m_blockFlow(blockFlow), m_context(context) { }
+
+    PaintInvalidationReason invalidatePaintIfNeeded();
+
+private:
+    const LayoutBlockFlow& m_blockFlow;
+    const PaintInvalidatorContext& m_context;
+};
+
+} // namespace blink
+
+#endif