gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/client/mapped_memory.h

 // Copyright (c) 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 GPU_COMMAND_BUFFER_CLIENT_MAPPED_MEMORY_H_
 #define GPU_COMMAND_BUFFER_CLIENT_MAPPED_MEMORY_H_
 
 #include "base/memory/scoped_vector.h"
 #include "gpu/command_buffer/client/fenced_allocator.h"
 #include "gpu/command_buffer/common/buffer.h"
@@ skipping 61 matching lines @@
   // Frees a block of memory, pending the passage of a token. That memory won't
   // be re-allocated until the token has passed through the command stream.
   //
   // Parameters:
   //   pointer: the pointer to the memory block to free.
   //   token: the token value to wait for before re-using the memory.
   void FreePendingToken(void* pointer, unsigned int token) {
     allocator_.FreePendingToken(pointer, token);
   }
 
+  void FreePendingAsyncToken(void* pointer, uint32 async_token) {
+    allocator_.FreePendingAsyncToken(pointer, async_token);
+  }
+
   // Frees any blocks whose tokens have passed.
   void FreeUnused() {
     allocator_.FreeUnused();
   }
 
   // Returns true if pointer is in the range of this block.
   bool IsInChunk(void* pointer) const {
     return pointer >= shm_.ptr &&
            pointer < reinterpret_cast<const int8*>(shm_.ptr) + shm_.size;
   }
@@ skipping 54 matching lines @@
   void Free(void* pointer);
 
   // Frees a block of memory, pending the passage of a token. That memory won't
   // be re-allocated until the token has passed through the command stream.
   //
   // Parameters:
   //   pointer: the pointer to the memory block to free.
   //   token: the token value to wait for before re-using the memory.
   void FreePendingToken(void* pointer, int32 token);
 
+  void FreePendingAsyncToken(void *pointer, uint32 async_token);
+
   // Free Any Shared memory that is not in use.
   void FreeUnused();
 
   // Used for testing
   size_t num_chunks() const {
     return chunks_.size();
   }
 
   // Used for testing
   size_t allocated_memory() const {
@@ skipping 10 matching lines @@
   size_t allocated_memory_;
   size_t max_free_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(MappedMemoryManager);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_MAPPED_MEMORY_H_