SetNeedsRedraw directly when updating a visible tile.

cc/resources/tile.h

 // Copyright 2012 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_RESOURCES_TILE_H_
 #define CC_RESOURCES_TILE_H_
 
 #include "base/memory/ref_counted.h"
 #include "cc/base/ref_counted_managed.h"
 #include "cc/resources/managed_tile_state.h"
@@ skipping 48 matching lines @@
   // TODO(vmpstr): Move this to the iterators.
   void set_is_occluded(WhichTree tree, bool is_occluded) {
     is_occluded_[tree] = is_occluded;
   }
 
   bool is_occluded(WhichTree tree) const { return is_occluded_[tree]; }
 
   void set_shared(bool is_shared) { is_shared_ = is_shared; }
   bool is_shared() const { return is_shared_; }
 
+  bool is_active_and_visible_priority() const {
+    return priority(ACTIVE_TREE).distance_to_visible == 0.f;
+  }
+
   bool is_occluded_for_tree_priority(TreePriority tree_priority) const {
     switch (tree_priority) {
       case SMOOTHNESS_TAKES_PRIORITY:
         return is_occluded_[ACTIVE_TREE];
       case NEW_CONTENT_TAKES_PRIORITY:
         return is_occluded_[PENDING_TREE];
       case SAME_PRIORITY_FOR_BOTH_TREES:
         return is_occluded_[ACTIVE_TREE] && is_occluded_[PENDING_TREE];
       default:
         NOTREACHED();
@@ skipping 98 matching lines @@
 
   Id id_;
   static Id s_next_id_;
 
   DISALLOW_COPY_AND_ASSIGN(Tile);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_H_