Enforce a memory limit on MappedMemoryManager

gpu/command_buffer/client/fenced_allocator.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.
 
 // This file contains the definition of the FencedAllocator class.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_
 #define GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_
 
 #include <vector>
@@ skipping 65 matching lines @@
   // block.
   unsigned int GetLargestFreeOrPendingSize();
 
   // Checks for consistency inside the book-keeping structures. Used for
   // testing.
   bool CheckConsistency();
 
   // True if any memory is allocated.
   bool InUse();
 
+  // Return bytes of memory that is IN_USE
+  size_t bytes_in_use() const { return bytes_in_use_; }
+
  private:
   // Status of a block of memory, for book-keeping.
   enum State {
     IN_USE,
     FREE,
     FREE_PENDING_TOKEN
   };
 
   // Book-keeping sturcture that describes a block of memory.
   struct Block {
@@ skipping 31 matching lines @@
 
   // Allocates a block of memory inside a given block, splitting it in two
   // (unless that block is of the exact requested size).
   // NOTE: this will invalidate block indices.
   // Returns the offset of the allocated block (NOTE: this is different from
   // the other functions that return a block index).
   Offset AllocInBlock(BlockIndex index, unsigned int size);
 
   CommandBufferHelper *helper_;
   Container blocks_;
+  size_t bytes_in_use_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(FencedAllocator);
 };
 
 // This class functions just like FencedAllocator, but its API uses pointers
 // instead of offsets.
 class FencedAllocatorWrapper {
  public:
   FencedAllocatorWrapper(unsigned int size,
                          CommandBufferHelper* helper,
@@ skipping 89 matching lines @@
     return allocator_.CheckConsistency();
   }
 
   // True if any memory is allocated.
   bool InUse() {
     return allocator_.InUse();
   }
 
   FencedAllocator &allocator() { return allocator_; }
 
+  size_t bytes_in_use() const { return allocator_.bytes_in_use(); }
+
  private:
   FencedAllocator allocator_;
   void* base_;
   DISALLOW_IMPLICIT_CONSTRUCTORS(FencedAllocatorWrapper);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_