cc: Fix size_t to int truncations in tiles/ and trees/

cc/resources/memory_history.h

 // Copyright 2013 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_MEMORY_HISTORY_H_
 #define CC_RESOURCES_MEMORY_HISTORY_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "cc/debug/ring_buffer.h"
 
 namespace cc {
 
 // Maintains a history of memory for each frame.
 class MemoryHistory {
  public:
   static scoped_ptr<MemoryHistory> Create();
 
   size_t HistorySize() const { return ring_buffer_.BufferSize(); }
 
   struct Entry {
     Entry()
         : total_budget_in_bytes(0),
           total_bytes_used(0),
           had_enough_memory(false) {}
 
     size_t total_budget_in_bytes;
-    size_t total_bytes_used;
+    int64 total_bytes_used;
     bool had_enough_memory;
   };
 
   void SaveEntry(const Entry& entry);
-  void GetMinAndMax(size_t* min, size_t* max) const;
 
   typedef RingBuffer<Entry, 80> RingBufferType;
   RingBufferType::Iterator Begin() const { return ring_buffer_.Begin(); }
   RingBufferType::Iterator End() const { return ring_buffer_.End(); }
 
  private:
   MemoryHistory();
 
   RingBufferType ring_buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(MemoryHistory);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_MEMORY_HISTORY_H_