HUD: Show first paint invalidation in red

cc/debug/layer_debug_info.h

+// Copyright 2014 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 CC_DEBUG_LAYER_DEBUG_INFO_H_
+#define CC_DEBUG_LAYER_DEBUG_INFO_H_
+
+#include <string>
+#include <vector>
+
+#include "base/debug/trace_event_impl.h"
+#include "cc/base/cc_export.h"
+
+namespace cc {
+
+struct DebugRect;
+class Layer;
+
+class CC_EXPORT LayerDebugInfo : public base::debug::ConvertableToTraceFormat {
+ public:
+  virtual std::vector<DebugRect> GetInvalidationRects(Layer* layer) const;
+
+ protected:
+  virtual ~LayerDebugInfo() {}
+};
+
+}  // namespace cc
+
+#endif  // CC_DEBUG_LAYER_DEBUG_INFO_H_