gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/client/mapped_memory.cc

 // Copyright (c) 2011 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.
 
 #include "gpu/command_buffer/client/mapped_memory.h"
 
 #include <algorithm>
 #include <functional>
 
 #include "base/debug/trace_event.h"
@@ skipping 99 matching lines @@
   for (size_t ii = 0; ii < chunks_.size(); ++ii) {
     MemoryChunk* chunk = chunks_[ii];
     if (chunk->IsInChunk(pointer)) {
       chunk->FreePendingToken(pointer, token);
       return;
     }
   }
   NOTREACHED();
 }
 
+void MappedMemoryManager::FreePendingSerial(void *pointer, uint32 serial) {
+  for (size_t ii = 0; ii < chunks_.size(); ++ii) {
+    MemoryChunk* chunk = chunks_[ii];
+    if (chunk->IsInChunk(pointer)) {
+      chunk->FreePendingSerial(pointer, serial);
+      return;
+    }
+  }
+  NOTREACHED();
+}
+
 void MappedMemoryManager::FreeUnused() {
   CommandBuffer* cmd_buf = helper_->command_buffer();
   MemoryChunkVector::iterator iter = chunks_.begin();
   while (iter != chunks_.end()) {
     MemoryChunk* chunk = *iter;
     chunk->FreeUnused();
     if (!chunk->InUse()) {
       cmd_buf->DestroyTransferBuffer(chunk->shm_id());
       allocated_memory_ -= chunk->GetSize();
       iter = chunks_.erase(iter);
     } else {
       ++iter;
     }
   }
 }
 
 }  // namespace gpu