Revert of Re-land: cc: Use worker context for one-copy tile initialization.

cc/resources/resource_pool.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_RESOURCE_POOL_H_
 #define CC_RESOURCES_RESOURCE_POOL_H_
 
 #include <deque>
 
 #include "base/containers/scoped_ptr_map.h"
@@ skipping 23 matching lines @@
 
   Resource* AcquireResource(const gfx::Size& size, ResourceFormat format);
   Resource* TryAcquireResourceWithContentId(uint64 content_id);
   void ReleaseResource(Resource* resource, uint64_t content_id);
 
   void SetResourceUsageLimits(size_t max_memory_usage_bytes,
                               size_t max_unused_memory_usage_bytes,
                               size_t max_resource_count);
 
   void ReduceResourceUsage();
-  void CheckBusyResources();
+  // This might block if |wait_if_needed| is true and one of the currently
+  // busy resources has a read lock fence that needs to be waited upon before
+  // it can be locked for write again.
+  void CheckBusyResources(bool wait_if_needed);
 
   size_t total_memory_usage_bytes() const { return memory_usage_bytes_; }
   size_t acquired_memory_usage_bytes() const {
     return memory_usage_bytes_ - unused_memory_usage_bytes_;
   }
   size_t total_resource_count() const { return resource_count_; }
   size_t acquired_resource_count() const {
     return resource_count_ - unused_resources_.size();
   }
   size_t busy_resource_count() const { return busy_resources_.size(); }
@@ skipping 46 matching lines @@
 
   using ResourceMap = base::ScopedPtrMap<ResourceId, scoped_ptr<PoolResource>>;
   ResourceMap in_use_resources_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourcePool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_POOL_H_