cc: Add checker-imaging support to TileManager.

cc/tiles/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/tiles/picture_layer_tiling_set.h"
 
 #include <stddef.h>
 
 #include <limits>
 #include <set>
@@ skipping 177 matching lines @@
   for (const auto& tiling : tilings_) {
     tiling->SetRasterSourceAndResize(raster_source);
     tiling->Invalidate(layer_invalidation);
     state_since_last_tile_priority_update_.invalidated = true;
     // Since the invalidation changed, we need to create any missing tiles in
     // the live tiles rect again.
     tiling->CreateMissingTilesInLiveTilesRect();
   }
 }
 
+void PictureLayerTilingSet::UpdateTilingsForImplSideInvalidation(

[vmpstr, 2017/02/03 23:42:32]

Invalidate?

[Khushal, 2017/02/07 00:25:32]

You mean InvalidateTilings...? I kept it consistent with other function names
above.

+    const Region& layer_invalidation) {
+  for (const auto& tiling : tilings_) {
+    tiling->Invalidate(layer_invalidation);
+    state_since_last_tile_priority_update_.invalidated = true;
+    tiling->CreateMissingTilesInLiveTilesRect();
+  }
+}
+
 void PictureLayerTilingSet::VerifyTilings(
     const PictureLayerTilingSet* pending_twin_set) const {
 #if DCHECK_IS_ON()
   for (const auto& 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();
@@ skipping 563 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