Allow one-copy task tile worker pool to use compressed textures.

cc/tiles/tile_manager.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/tile_manager.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 
@@ skipping 653 matching lines @@
   Resource* resource = nullptr;
   if (use_partial_raster_ && tile->invalidated_id()) {
     // TODO(danakj): For resources that are in use, we should still grab them
     // and copy from them instead of rastering everything. crbug.com/492754
     resource =
         resource_pool_->TryAcquireResourceWithContentId(tile->invalidated_id());
   }
   if (resource) {
     resource_content_id = tile->invalidated_id();
     DCHECK_EQ(DetermineResourceFormat(tile), resource->format());
-    DCHECK_EQ(tile->desired_texture_size().ToString(),
-              resource->size().ToString());
+    if (!IsResourceFormatCompressed(resource->format())) {

[reveman, 2015/12/02 18:27:18]

nit: is this conditional still needed? In that case please use:

DCHECK_IMPLIES(!IsResourceFormatCompressed(reso..),
               tile->desired_texture_size().ToString() ==
               resource->size().ToString());

[christiank, 2015/12/03 12:57:59]

No longer need, removed.

+      DCHECK_EQ(tile->desired_texture_size().ToString(),
+                resource->size().ToString());
+    }
   } else {
     resource = resource_pool_->AcquireResource(tile->desired_texture_size(),
                                                DetermineResourceFormat(tile));
   }
 
   // Create and queue all image decode tasks that this tile depends on.
   ImageDecodeTask::Vector decode_tasks;
   std::vector<DrawImage> images;
   prioritized_tile.raster_source()->GetDiscardableImagesInRect(
       tile->enclosing_layer_rect(), tile->contents_scale(), &images);
@@ skipping 331 matching lines @@
 void TileManager::Signals::reset() {
   ready_to_activate = false;
   did_notify_ready_to_activate = false;
   ready_to_draw = false;
   did_notify_ready_to_draw = false;
   all_tile_tasks_completed = false;
   did_notify_all_tile_tasks_completed = false;
 }
 
 }  // namespace cc