Add initial GLImage tracing + stubs

base/memory/generic_shared_memory_id.h

Index: base/memory/generic_shared_memory_id.h
diff --git a/base/memory/generic_shared_memory_id.h b/base/memory/generic_shared_memory_id.h
new file mode 100644
index 0000000000000000000000000000000000000000..e9f45956c5cc435fdcd0365d7548bff4c481d40a
--- /dev/null
+++ b/base/memory/generic_shared_memory_id.h
@@ -0,0 +1,26 @@
+// 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 BASE_TRACE_EVENT_GENERIC_SHARED_MEMORY_ID_H_
+#define BASE_TRACE_EVENT_GENERIC_SHARED_MEMORY_ID_H_
+
+#include "base/base_export.h"
+#include "base/trace_event/memory_allocator_dump.h"
+
+namespace base {
+
+namespace trace_event {
+
+using GenericSharedMemoryId = int;
+
+BASE_EXPORT base::trace_event::MemoryAllocatorDumpGuid
+GetGenericSharedMemoryGUIDForTracing(
+    uint64_t tracing_process_id,
+    GenericSharedMemoryId generic_shared_memory_id);
+
+}  // namespace trace_event
+
+}  // namespace base
+
+#endif  // BASE_TRACE_EVENT_GENERIC_SHARED_MEMORY_ID_H_