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

gpu/command_buffer/service/transfer_buffer_manager.cc

Index: gpu/command_buffer/service/transfer_buffer_manager.cc
diff --git a/gpu/command_buffer/service/transfer_buffer_manager.cc b/gpu/command_buffer/service/transfer_buffer_manager.cc
index 8fd4050d04b96b5d0822254913716e5fa7eabe7d..a061f0b39839c8da8ea0b6b27e92cfb20d96a974 100644
--- a/gpu/command_buffer/service/transfer_buffer_manager.cc
+++ b/gpu/command_buffer/service/transfer_buffer_manager.cc
@@ -10,6 +10,7 @@
 #include <memory>
 
 #include "base/logging.h"
+#include "base/memory/shared_memory_tracker.h"
 #include "base/process/process_handle.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ -35,7 +36,7 @@ TransferBufferManager::TransferBufferManager(
 TransferBufferManager::~TransferBufferManager() {
   while (!registered_buffers_.empty()) {
     BufferMap::iterator it = registered_buffers_.begin();
-    if (it->second->backing()->is_shared()) {
+    if (it->second->backing()->shared_memory()) {
       DCHECK(shared_memory_bytes_allocated_ >= it->second->size());
       shared_memory_bytes_allocated_ -= it->second->size();
     }
@@ -79,7 +80,7 @@ bool TransferBufferManager::RegisterTransferBuffer(
   DCHECK(!(reinterpret_cast<uintptr_t>(buffer->memory()) &
            (kCommandBufferEntrySize - 1)));
 
-  if (buffer->backing()->is_shared())
+  if (buffer->backing()->shared_memory())
     shared_memory_bytes_allocated_ += buffer->size();
   registered_buffers_[id] = buffer;
 
@@ -93,7 +94,7 @@ void TransferBufferManager::DestroyTransferBuffer(int32_t id) {
     return;
   }
 
-  if (it->second->backing()->is_shared()) {
+  if (it->second->backing()->shared_memory()) {
     DCHECK(shared_memory_bytes_allocated_ >= it->second->size());
     shared_memory_bytes_allocated_ -= it->second->size();
   }
@@ -138,11 +139,15 @@ bool TransferBufferManager::OnMemoryDump(
     MemoryAllocatorDump* dump = pmd->CreateAllocatorDump(dump_name);
     dump->AddScalar(MemoryAllocatorDump::kNameSize,
                     MemoryAllocatorDump::kUnitsBytes, buffer->size());
-    if (buffer->backing()->is_shared()) {
+    base::SharedMemory* shared_memory =
+        buffer_entry.second->backing()->shared_memory();
+    if (shared_memory) {
       auto guid = GetBufferGUIDForTracing(memory_tracker_->ClientTracingId(),
                                           buffer_id);
       pmd->CreateSharedGlobalAllocatorDump(guid);
       pmd->AddOwnershipEdge(dump->guid(), guid);
+      base::SharedMemoryTracker::AddOwnershipEdgeToSharedGlobalDump(pmd, guid,
+          shared_memory->handle(), shared_memory->mapped_size());
     }
   }