Add support for GL_CHROMIUM_pixel_transfer_buffer_object.

gpu/command_buffer/client/buffer_tracker.h

Index: gpu/command_buffer/client/buffer_tracker.h
diff --git a/gpu/command_buffer/client/buffer_tracker.h b/gpu/command_buffer/client/buffer_tracker.h
new file mode 100644
index 0000000000000000000000000000000000000000..54f5bc793d3a785929f12a93e19cfe430ab866a8
--- /dev/null
+++ b/gpu/command_buffer/client/buffer_tracker.h
@@ -0,0 +1,103 @@
+// 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_BUFFER_TRACKER_H_
+#define GPU_COMMAND_BUFFER_CLIENT_BUFFER_TRACKER_H_
+
+#include <GLES2/gl2.h>
+
+#include <queue>
+#include "../client/hash_tables.h"
+#include "../common/gles2_cmd_format.h"
+#include "gles2_impl_export.h"
+
+namespace gpu {
+
+class CommandBufferHelper;
+class MappedMemoryManager;
+
+namespace gles2 {
+
+// Tracks buffer objects for client side of command buffer.
+class GLES2_IMPL_EXPORT BufferTracker {
+ public:
+  class GLES2_IMPL_EXPORT Buffer {
+   public:
+    Buffer(GLuint id,
+           unsigned int size,
+           int32 shm_id,
+           uint32 shm_offset,
+           void* address)
+        : id_(id),
+          size_(size),
+          shm_id_(shm_id),
+          shm_offset_(shm_offset),
+          address_(address),
+          mapped_(false) {
+    }
+
+    GLenum id() const {
+      return id_;
+    }
+
+    unsigned int size() const {
+      return size_;
+    }
+
+    int32 shm_id() const {
+      return shm_id_;
+    }
+
+    uint32 shm_offset() const {
+      return shm_offset_;
+    }
+
+    void* address() const {
+      return address_;
+    }
+
+    void set_mapped(bool mapped) {
+      mapped_ = mapped;
+    }
+
+    bool mapped() const {
+      return mapped_;
+    }
+
+   private:
+    friend class BufferTracker;
+    friend class BufferTrackerTest;
+
+    GLuint id_;
+    unsigned int size_;
+    int32 shm_id_;
+    uint32 shm_offset_;
+    void* address_;
+    bool mapped_;
+  };
+
+  BufferTracker(MappedMemoryManager* manager);
+  ~BufferTracker();
+
+  Buffer* CreateBuffer(GLuint id, GLsizeiptr size);
+  Buffer* GetBuffer(GLuint id);
+  void RemoveBuffer(GLuint id);
+
+  // Frees the block of memory associated with buffer, pending the passage
+  // of a token.
+  void FreePendingToken(Buffer*, int32 token);
+
+ private:
+  typedef gpu::hash_map<GLuint, Buffer*> BufferMap;
+
+  MappedMemoryManager* mapped_memory_;
+  BufferMap buffers_;
+
+  DISALLOW_COPY_AND_ASSIGN(BufferTracker);
+};
+
+}  // namespace gles2
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_CLIENT_BUFFER_TRACKER_H_