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

cc/raster/staging_buffer_pool.cc

 // Copyright 2016 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 "cc/raster/staging_buffer_pool.h"
 
 #include <memory>
 
 #include "base/memory/memory_coordinator_client_registry.h"
 #include "base/memory/ptr_util.h"
+#include "base/memory/shared_memory_tracker.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "cc/base/container_util.h"
 #include "cc/debug/traced_value.h"
 #include "cc/resources/scoped_resource.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "ui/gfx/gpu_memory_buffer_tracing.h"
 
 using base::trace_event::MemoryAllocatorDump;
@@ skipping 94 matching lines @@
       base::trace_event::MemoryDumpManager::GetInstance()
           ->GetTracingProcessId();
   MemoryAllocatorDumpGuid shared_buffer_guid =
       gfx::GetGpuMemoryBufferGUIDForTracing(tracing_process_id, buffer_id);
   pmd->CreateSharedGlobalAllocatorDump(shared_buffer_guid);
 
   // By creating an edge with a higher |importance| (w.r.t. browser-side dumps)
   // the tracing UI will account the effective size of the buffer to the child.
   const int kImportance = 2;
   pmd->AddOwnershipEdge(buffer_dump->guid(), shared_buffer_guid, kImportance);
+
+  base::SharedMemoryHandle shared_memory_handle =
+      gpu_memory_buffer->GetHandle().handle;
+  base::SharedMemoryTracker::AddOwnershipEdgeToSharedGlobalDump(
+      pmd, shared_buffer_guid, shared_memory_handle, buffer_size_in_bytes);
 }
 
 StagingBufferPool::StagingBufferPool(base::SequencedTaskRunner* task_runner,
                                      ContextProvider* worker_context_provider,
                                      ResourceProvider* resource_provider,
                                      bool use_partial_raster,
                                      int max_staging_buffer_usage_in_bytes)
     : task_runner_(task_runner),
       worker_context_provider_(worker_context_provider),
       resource_provider_(resource_provider),
@@ skipping 311 matching lines @@
       // Release all buffers, regardless of how recently they were used.
       ReleaseBuffersNotUsedSince(base::TimeTicks() + base::TimeDelta::Max());
     } break;
     case base::MemoryState::UNKNOWN:
       // NOT_REACHED.
       break;
   }
 }
 
 }  // namespace cc