HUD: Show first paint invalidation in red

cc/debug/layer_debug_info.cc

Index: cc/debug/layer_debug_info.cc
diff --git a/cc/debug/layer_debug_info.cc b/cc/debug/layer_debug_info.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a86046c42bd7b55d312bfe047a55e91ac9a70422
--- /dev/null
+++ b/cc/debug/layer_debug_info.cc
@@ -0,0 +1,19 @@
+// 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.
+
+#include "cc/debug/layer_debug_info.h"
+
+#include <vector>
+
+#include "cc/debug/debug_rect_history.h"
+
+namespace cc {
+
+std::vector<DebugRect> LayerDebugInfo::GetInvalidationRects(
+    Layer* layer) const {
+  NOTREACHED();
+  return std::vector<DebugRect>();
+}
+
+}  // namespace cc