base: Change DCHECK_IS_ON to a macro DCHECK_IS_ON().

cc/resources/picture_layer_tiling_set.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_set.h"
 
 #include <limits>
 #include <set>
 #include <vector>
 
@@ skipping 87 matching lines @@
     tiling->CreateMissingTilesInLiveTilesRect();
 
     // If |twin_set| is present, use the resolutions from there. Otherwise leave
     // all resolutions as they are.
     if (twin_set)
       tiling->set_resolution(NON_IDEAL_RESOLUTION);
   }
 
   tilings_.sort(LargestToSmallestScaleFunctor());
 
-#if DCHECK_IS_ON
+#if !DCHECK_IS_OFF
   for (PictureLayerTiling* tiling : tilings_) {
     DCHECK(tiling->tile_size() ==
            client_->CalculateTileSize(tiling->tiling_size()))
         << "tile_size: " << tiling->tile_size().ToString()
         << " tiling_size: " << tiling->tiling_size().ToString()
         << " CalculateTileSize: "
         << client_->CalculateTileSize(tiling->tiling_size()).ToString();
   }
 
   if (!tilings_.empty()) {
@@ skipping 423 matching lines @@
     case LOWER_THAN_LOW_RES:
       range = TilingRange(low_res_range.end, tilings_.size());
       break;
   }
 
   DCHECK_LE(range.start, range.end);
   return range;
 }
 
 }  // namespace cc