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

components/discardable_memory/service/discardable_shared_memory_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 "components/discardable_memory/service/discardable_shared_memory_manager.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/debug/crash_logging.h"
 #include "base/macros.h"
 #include "base/memory/discardable_memory.h"
 #include "base/memory/memory_coordinator_client_registry.h"
 #include "base/memory/ptr_util.h"
+#include "base/memory/shared_memory_tracker.h"
 #include "base/numerics/safe_math.h"
 #include "base/process/memory.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/sys_info.h"
 #include "base/threading/thread_task_runner_handle.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 "base/trace_event/trace_event.h"
@@ skipping 292 matching lines @@
       // corresponding dump for the same segment, this will avoid to
       // 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.
       const uint64_t client_tracing_id =
           ClientProcessUniqueIdToTracingProcessId(client_id);
       base::trace_event::MemoryAllocatorDumpGuid shared_segment_guid =
           DiscardableSharedMemoryHeap::GetSegmentGUIDForTracing(
               client_tracing_id, segment_id);
       pmd->CreateSharedGlobalAllocatorDump(shared_segment_guid);
       pmd->AddOwnershipEdge(dump->guid(), shared_segment_guid);
+      base::SharedMemoryTracker::AddOwnershipEdgeToSharedGlobalDump(
+          pmd, shared_segment_guid,
+          segment->memory()->handle(), segment->memory()->mapped_size());
 
 #if defined(COUNT_RESIDENT_BYTES_SUPPORTED)
       if (args.level_of_detail ==
           base::trace_event::MemoryDumpLevelOfDetail::DETAILED) {
         size_t resident_size =
             base::trace_event::ProcessMemoryDump::CountResidentBytes(
                 segment->memory()->memory(), segment->memory()->mapped_size());
 
         // This is added to the global dump since it has to be attributed to
         // both the allocator dumps involved.
@@ skipping 276 matching lines @@
     return;
 
   enforce_memory_policy_pending_ = true;
   DCHECK(enforce_memory_policy_task_runner_);
   enforce_memory_policy_task_runner_->PostDelayedTask(
       FROM_HERE, enforce_memory_policy_callback_,
       base::TimeDelta::FromMilliseconds(kEnforceMemoryPolicyDelayMs));
 }
 
 }  // namespace discardable_memory