First step of PaintInvalidator implementation

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

Index: third_party/WebKit/Source/core/paint/HTMLCanvasPaintInvalidator.h
diff --git a/third_party/WebKit/Source/core/paint/HTMLCanvasPaintInvalidator.h b/third_party/WebKit/Source/core/paint/HTMLCanvasPaintInvalidator.h
new file mode 100644
index 0000000000000000000000000000000000000000..ac4f7fb2cf6faab5bcebf0b3add5c52a8ef7cb0a
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+++ b/third_party/WebKit/Source/core/paint/HTMLCanvasPaintInvalidator.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 HTMLCanvasPaintInvalidator_h
+#define HTMLCanvasPaintInvalidator_h
+
+#include "platform/graphics/PaintInvalidationReason.h"
+#include "wtf/Allocator.h"
+
+namespace blink {
+
+class LayoutHTMLCanvas;
+struct PaintInvalidatorContext;
+
+class HTMLCanvasPaintInvalidator {
+    STACK_ALLOCATED();
+public:
+    HTMLCanvasPaintInvalidator(const LayoutHTMLCanvas& htmlCanvas, const PaintInvalidatorContext& context)
+        : m_htmlCanvas(htmlCanvas), m_context(context) { }
+
+    PaintInvalidationReason invalidatePaintIfNeeded();
+
+private:
+    const LayoutHTMLCanvas& m_htmlCanvas;
+    const PaintInvalidatorContext& m_context;
+};
+
+} // namespace blink
+
+#endif