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

content/common/host_shared_bitmap_manager.cc

Index: content/common/host_shared_bitmap_manager.cc
diff --git a/content/common/host_shared_bitmap_manager.cc b/content/common/host_shared_bitmap_manager.cc
index 51f4fc79160d8f6c39f84f468930c95ba0504606..dc1bc1532640d638a7ce0e2bdda8f57ad9f429f9 100644
--- a/content/common/host_shared_bitmap_manager.cc
+++ b/content/common/host_shared_bitmap_manager.cc
@@ -12,6 +12,7 @@
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/shared_memory_dump_provider.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/trace_event/process_memory_dump.h"
 #include "build/build_config.h"
@@ -178,6 +179,8 @@ bool HostSharedBitmapManager::OnMemoryDump(
     auto guid = cc::GetSharedBitmapGUIDForTracing(bitmap.first);
     pmd->CreateSharedGlobalAllocatorDump(guid);
     pmd->AddOwnershipEdge(dump->guid(), guid);
+    base::SharedMemoryDumpProvider::GetInstance()->AddSuballocation(
+        pmd, dump->guid());
   }
 
   return true;
@@ -225,7 +228,7 @@ void HostSharedBitmapManager::AllocateSharedBitmapForChild(
     *shared_memory_handle = base::SharedMemory::NULLHandle();
     return;
   }
- data->memory->Close();
+  data->memory->Close();
 }
 
 void HostSharedBitmapManager::ChildDeletedSharedBitmap(