Add GenericSharedMemoryId and use w/ GpuMemoryBuffer

content/common/generic_shared_memory_id_generator.h

Index: content/common/generic_shared_memory_id_generator.h
diff --git a/content/common/generic_shared_memory_id_generator.h b/content/common/generic_shared_memory_id_generator.h
new file mode 100644
index 0000000000000000000000000000000000000000..4640cc1cb07e3750d7e57107c69827b3a62fd9cd
--- /dev/null
+++ b/content/common/generic_shared_memory_id_generator.h
@@ -0,0 +1,19 @@
+// Copyright 2015 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 CONTENT_COMMON_GENERIC_SHARED_MEMORY_ID_GENERATOR_H_
+#define CONTENT_COMMON_GENERIC_SHARED_MEMORY_ID_GENERATOR_H_
+
+#include "ui/gfx/generic_shared_memory_id.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+// Returns the next GenericSharedMemoryId for the current process. This should
+// be used anywhere a new GenericSharedMemoryId is needed.
+CONTENT_EXPORT gfx::GenericSharedMemoryId GetNextGenericSharedMemoryId();
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GENERIC_SHARED_MEMORY_ID_GENERATOR_H_