cc: Add command line switch to control resource usage for impl-side painting.

cc/resources/tile_priority.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_TILE_PRIORITY_H_
 #define CC_RESOURCES_TILE_PRIORITY_H_
 
 #include <algorithm>
 #include <limits>
 
@@ skipping 158 matching lines @@
 
   // Be sure to update TreePriorityAsValue when adding new fields.
 };
 scoped_ptr<base::Value> TreePriorityAsValue(TreePriority prio);
 
 class GlobalStateThatImpactsTilePriority {
  public:
   GlobalStateThatImpactsTilePriority()
     : memory_limit_policy(ALLOW_NOTHING)
     , memory_limit_in_bytes(0)
+    , unused_memory_limit_in_bytes(0)
     , tree_priority(SAME_PRIORITY_FOR_BOTH_TREES) {
   }
 
   TileMemoryLimitPolicy memory_limit_policy;
 
   size_t memory_limit_in_bytes;
+  size_t unused_memory_limit_in_bytes;
 
   TreePriority tree_priority;
 
   scoped_ptr<base::Value> AsValue() const;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_PRIORITY_H_