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

content/browser/gpu/browser_gpu_memory_buffer_manager.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 "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 174 matching lines @@
       // double-count them in tracing. If, instead, no other process will emit a
       // dump with the same guid, the segment will be accounted to the browser.
       uint64_t client_tracing_process_id =
           ClientIdToTracingProcessId(client_id);
 
       base::trace_event::MemoryAllocatorDumpGuid shared_buffer_guid =
           gfx::GetGpuMemoryBufferGUIDForTracing(client_tracing_process_id,
                                                 buffer_id);
       pmd->CreateSharedGlobalAllocatorDump(shared_buffer_guid);
       pmd->AddOwnershipEdge(dump->guid(), shared_buffer_guid);
+      // TODO(hajimehoshi): GpuMemoryBuffer is allocated in SharedMemory. Get
+      // shared memory handle of that and call
+      // base::SharedMemoryDumpProvider::AddOwnershipEdgeToSharedGlobalDump here
     }
   }
 
   return true;
 }
 
 void BrowserGpuMemoryBufferManager::ChildProcessDeletedGpuMemoryBuffer(
     gfx::GpuMemoryBufferId id,
     int child_client_id,
     const gpu::SyncToken& sync_token) {
@@ skipping 302 matching lines @@
       format(format),
       usage(usage),
       gpu_host_id(gpu_host_id) {}
 
 BrowserGpuMemoryBufferManager::BufferInfo::BufferInfo(const BufferInfo& other) =
     default;
 
 BrowserGpuMemoryBufferManager::BufferInfo::~BufferInfo() {}
 
 }  // namespace content