HUD: Show first paint invalidation in red

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index b09cb3f4970792d56829a9899dcd48d048450527..910518844e2bb92939b8d1822cd455c82bf57632 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -469,8 +469,14 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
 
   // Note this rect is in layer space (not content space).
   void SetUpdateRect(const gfx::RectF& update_rect);
+  void SetIncludesFirstPaintInvalidation(bool b) {
+    includes_first_paint_invalidation_ = b;
+  }
 
   const gfx::RectF& update_rect() const { return update_rect_; }
+  bool includes_first_paint_invalidation() const {
+    return includes_first_paint_invalidation_;
+  }
 
   void AddDamageRect(const gfx::RectF& damage_rect);
 
@@ -686,6 +692,8 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
   // Uses layer (not content) space.
   gfx::RectF update_rect_;
 
+  bool includes_first_paint_invalidation_;
+
   // This rect is in layer space.
   gfx::RectF damage_rect_;