HUD: Show first paint invalidation in red

cc/blink/blink_layer_debug_info.h

Index: cc/blink/blink_layer_debug_info.h
diff --git a/cc/blink/blink_layer_debug_info.h b/cc/blink/blink_layer_debug_info.h
new file mode 100644
index 0000000000000000000000000000000000000000..51f47fbc058a5eb5b8ca2108bb4bcf8fc039acdb
--- /dev/null
+++ b/cc/blink/blink_layer_debug_info.h
@@ -0,0 +1,43 @@
+// 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_BLINK_BLINK_LAYER_DEBUG_INFO_H_
+#define CC_BLINK_BLINK_LAYER_DEBUG_INFO_H_
+
+#include <string>
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "cc/debug/layer_debug_info.h"
+
+namespace cc {
+struct DebugRect;
+}
+
+namespace blink {
+class WebGraphicsLayerDebugInfo;
+}
+
+namespace cc_blink {
+
+class BlinkLayerDebugInfo : public cc::LayerDebugInfo {
+ public:
+  // This object takes ownership of the debug_info object.
+  explicit BlinkLayerDebugInfo(blink::WebGraphicsLayerDebugInfo* debug_info);
+
+  virtual void AppendAsTraceFormat(std::string* out) const OVERRIDE;
+  virtual std::vector<cc::DebugRect> GetInvalidationRects(
+      cc::Layer*) const OVERRIDE;
+
+ private:
+  virtual ~BlinkLayerDebugInfo();
+
+  scoped_ptr<blink::WebGraphicsLayerDebugInfo> debug_info_;
+  base::ThreadChecker thread_checker_;
+};
+
+}  // namespace cc_blink
+
+#endif  // CC_BLINK_BLINK_LAYER_DEBUG_INFO_H_