Add GLES2Implemention::FreeUnusedSharedMemory

gpu/command_buffer/client/mapped_memory.h

 // Copyright (c) 2009 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 <vector>
 
 #include "../common/types.h"
@@ skipping 72 matching lines @@
   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;
   }
 
+  // Returns true of any memory in this chuck is in use.
+  bool InUse() {
+    return allocator_.InUse();
+  }
+
  private:
   int32 shm_id_;
   gpu::Buffer shm_;
   FencedAllocatorWrapper allocator_;
 
   DISALLOW_COPY_AND_ASSIGN(MemoryChunk);
 };
 
 // Manages MemoryChucks.
 class MappedMemoryManager {
@@ skipping 19 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);
 
+  // Free Any Shared memory that is not in use.
+  void FreeUnused();
+
+  // Used for testing
+  size_t num_chunks() {
+    return chunks_.size();
+  }
+
  private:
   typedef std::vector<MemoryChunk*> MemoryChunkVector;
 
   CommandBufferHelper* helper_;
   MemoryChunkVector chunks_;
 
   DISALLOW_COPY_AND_ASSIGN(MappedMemoryManager);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_MAPPED_MEMORY_H_