CC/GPU: Add a soft limit to the compositor.

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 119 matching lines @@
   NEW_CONTENT_TAKES_PRIORITY
 
   // 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),
+        soft_memory_limit_in_bytes(0),
+        hard_memory_limit_in_bytes(0),
         unused_memory_limit_in_bytes(0),
         num_resources_limit(0),
         tree_priority(SAME_PRIORITY_FOR_BOTH_TREES) {}
 
   TileMemoryLimitPolicy memory_limit_policy;
 
-  size_t memory_limit_in_bytes;
+  size_t soft_memory_limit_in_bytes;
+  size_t hard_memory_limit_in_bytes;
   size_t unused_memory_limit_in_bytes;
   size_t num_resources_limit;
 
   TreePriority tree_priority;
 
   bool operator==(const GlobalStateThatImpactsTilePriority& other) const {
     return memory_limit_policy == other.memory_limit_policy
-        && memory_limit_in_bytes == other.memory_limit_in_bytes
+        && soft_memory_limit_in_bytes == other.soft_memory_limit_in_bytes
+        && hard_memory_limit_in_bytes == other.hard_memory_limit_in_bytes
         && unused_memory_limit_in_bytes == other.unused_memory_limit_in_bytes
         && num_resources_limit == other.num_resources_limit
         && tree_priority == other.tree_priority;
   }
   bool operator!=(const GlobalStateThatImpactsTilePriority& other) const {
     return !(*this == other);
   }
 
   scoped_ptr<base::Value> AsValue() const;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_PRIORITY_H_