Implemented shared memory as an NPObject.

o3d/gpu_plugin/system_services/shared_memory.h

Index: o3d/gpu_plugin/system_services/shared_memory.h
===================================================================
--- o3d/gpu_plugin/system_services/shared_memory.h	(revision 0)
+++ o3d/gpu_plugin/system_services/shared_memory.h	(revision 0)
@@ -0,0 +1,55 @@
+// Copyright (c) 2006-2008 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 O3D_GPU_PLUGIN_SYSTEM_SERVICES_SHARED_MEMORY_H_
+#define O3D_GPU_PLUGIN_SYSTEM_SERVICES_SHARED_MEMORY_H_
+
+#include "base/shared_memory.h"
+#include "o3d/gpu_plugin/np_utils/default_np_object.h"
+#include "o3d/gpu_plugin/np_utils/np_dispatcher.h"
+#include "o3d/gpu_plugin/np_utils/np_object_pointer.h"
+#include "o3d/gpu_plugin/system_services/shared_memory_public.h"
+#include "third_party/npapi/bindings/npruntime.h"
+
+namespace o3d {
+namespace gpu_plugin {
+
+// An NPObject holding a shared memory handle.
+class SharedMemory : public DefaultNPObject<CHRSharedMemory> {
+ public:
+  explicit SharedMemory(NPP npp);
+  ~SharedMemory();
+
+  // Initialize from an existing base::SharedMemory. Takes ownership of the
+  // base::SharedMemory.
+  void Initialize(base::SharedMemory* shared_memory, int32 size);
+
+  virtual bool Initialize(int32 size);
+
+  virtual int32 GetSize() {
+    return size;
+  }
+
+  virtual bool Map();
+
+  base::SharedMemory* shared_memory() const {
+    return shared_memory_;
+  }
+
+  NP_UTILS_BEGIN_DISPATCHER_CHAIN(SharedMemory, DefaultNPObject<NPObject>)
+    NP_UTILS_DISPATCHER(Initialize, bool(int32));
+    NP_UTILS_DISPATCHER(GetSize, int32())
+    NP_UTILS_DISPATCHER(Map, bool())
+  NP_UTILS_END_DISPATCHER_CHAIN
+
+ private:
+  NPP npp_;
+  base::SharedMemory* shared_memory_;
+  DISALLOW_COPY_AND_ASSIGN(SharedMemory);
+};
+
+}  // namespace gpu_plugin
+}  // namespace o3d
+
+#endif  // O3D_GPU_PLUGIN_SYSTEM_SERVICES_SHARED_MEMORY_H_