[WIP] Add SharedMemoryTracker to dump base::SharedMemory usage

ui/gl/gl_image_shared_memory.cc

 // Copyright 2014 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.
 
 #include "ui/gl/gl_image_shared_memory.h"
 
 #include "base/logging.h"
 #include "base/memory/shared_memory.h"
+#include "base/memory/shared_memory_tracker.h"
 #include "base/numerics/safe_math.h"
 #include "base/process/process_handle.h"
 #include "base/sys_info.h"
 #include "base/trace_event/memory_allocator_dump.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/process_memory_dump.h"
 #include "ui/gfx/buffer_format_util.h"
 
 namespace gl {
 
@@ skipping 61 matching lines @@
     size_in_bytes = stride() * GetSize().height();
 
   // Dump under "/shared_memory", as the base class may also dump to
   // "/texture_memory".
   base::trace_event::MemoryAllocatorDump* dump =
       pmd->CreateAllocatorDump(dump_name + "/shared_memory");
   dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
                   base::trace_event::MemoryAllocatorDump::kUnitsBytes,
                   static_cast<uint64_t>(size_in_bytes));
 
-  auto guid = GetGenericSharedMemoryGUIDForTracing(process_tracing_id,
-                                                   shared_memory_id_);
-  pmd->CreateSharedGlobalAllocatorDump(guid);
-  pmd->AddOwnershipEdge(dump->guid(), guid);
+  if (shared_memory_) {
+    auto guid = GetGenericSharedMemoryGUIDForTracing(process_tracing_id,
+                                                     shared_memory_id_);
+    pmd->CreateSharedGlobalAllocatorDump(guid);
+    pmd->AddOwnershipEdge(dump->guid(), guid);
+    base::SharedMemoryTracker::AddOwnershipEdgeToSharedGlobalDump(
+        pmd, guid, shared_memory_->handle(), shared_memory_->mapped_size());
+  }
 }
 
 }  // namespace gl