cc: Always use invalidation on the pending tree when deciding to share

cc/resources/picture_layer_tiling.cc

 // 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.
 
 #include "cc/resources/picture_layer_tiling.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <set>
@@ skipping 108 matching lines @@
   gfx::Rect tile_rect = paint_rect;
   tile_rect.set_size(tiling_data_.max_texture_size());
 
   // Check our twin for a valid tile.
   if (twin_tiling &&
       tiling_data_.max_texture_size() ==
       twin_tiling->tiling_data_.max_texture_size()) {
     if (Tile* candidate_tile = twin_tiling->TileAt(i, j)) {
       gfx::Rect rect =
           gfx::ScaleToEnclosingRect(paint_rect, 1.0f / contents_scale_);
-      if (!client_->GetInvalidation()->Intersects(rect)) {
+      const Region* invalidation = client_->GetPendingInvalidation();
+      if (!invalidation || !invalidation->Intersects(rect)) {
         DCHECK(!candidate_tile->is_shared());
         DCHECK_EQ(i, candidate_tile->tiling_i_index());
         DCHECK_EQ(j, candidate_tile->tiling_j_index());
         candidate_tile->set_shared(true);
         tiles_[key] = candidate_tile;
         return candidate_tile;
       }
     }
   }
 
@@ skipping 1086 matching lines @@
   DCHECK(*this);
   do {
     ++current_eviction_tiles_index_;
   } while (current_eviction_tiles_index_ != eviction_tiles_->size() &&
            !(*eviction_tiles_)[current_eviction_tiles_index_]->HasResources());
 
   return *this;
 }
 
 }  // namespace cc