[tracing] Add SkResourceCache as suballocation to avoid double counting.

content/common/host_discardable_shared_memory_manager.cc

Index: content/common/host_discardable_shared_memory_manager.cc
diff --git a/content/common/host_discardable_shared_memory_manager.cc b/content/common/host_discardable_shared_memory_manager.cc
index d2afe38f1497de74b5d54d440600a75057005c71..b33bc8f3596b92163dda18a13b80317b11a3213b 100644
--- a/content/common/host_discardable_shared_memory_manager.cc
+++ b/content/common/host_discardable_shared_memory_manager.cc
@@ -155,6 +155,13 @@ HostDiscardableSharedMemoryManager::AllocateLockedDiscardableMemory(
 
 bool HostDiscardableSharedMemoryManager::OnMemoryDump(
     base::trace_event::ProcessMemoryDump* pmd) {
+  base::trace_event::MemoryAllocatorDump* objects_dump =
+      pmd->CreateAllocatorDump(GetMemoryPoolNameForTracing());
+  base::trace_event::MemoryAllocatorDump* discardable_segments_dump =
+      pmd->CreateAllocatorDump("discardable/segments");
+  pmd->AddOwnershipEdge(objects_dump->guid(),
+                        discardable_segments_dump->guid());
+
   base::AutoLock lock(lock_);
   for (const auto& process_entry : processes_) {
     const int child_process_id = process_entry.first;
@@ -162,8 +169,9 @@ bool HostDiscardableSharedMemoryManager::OnMemoryDump(
     for (const auto& segment_entry : process_segments) {
       const int segment_id = segment_entry.first;
       const MemorySegment* segment = segment_entry.second.get();
-      std::string dump_name = base::StringPrintf(
-          "discardable/process_%x/segment_%d", child_process_id, segment_id);
+      std::string dump_name =
+          base::StringPrintf("discardable/segments/process_%x/segment_%d",
+                             child_process_id, segment_id);
       base::trace_event::MemoryAllocatorDump* dump =
           pmd->CreateAllocatorDump(dump_name);
       dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,