[tracing] Add graphics memory dump provider for Android

base/trace_event/process_memory_dump.cc

 // Copyright 2015 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 "base/trace_event/process_memory_dump.h"
 
 #include "base/trace_event/process_memory_totals.h"
 #include "base/trace_event/trace_event_argument.h"
 
 namespace base {
@@ skipping 38 matching lines @@
   allocator_dumps_storage_.push_back(mad);
   allocator_dumps_[mad->absolute_name()] = mad;
 }
 
 MemoryAllocatorDump* ProcessMemoryDump::GetAllocatorDump(
     const std::string& absolute_name) const {
   auto it = allocator_dumps_.find(absolute_name);
   return it == allocator_dumps_.end() ? nullptr : it->second;
 }
 
+MemoryAllocatorDump* ProcessMemoryDump::GetOrCreateAllocatorDump(
+    const std::string& absolute_name) {
+  MemoryAllocatorDump* mad = GetAllocatorDump(absolute_name);
+  if (mad)
+    return mad;
+  return CreateAllocatorDump(absolute_name);
+}
+
 MemoryAllocatorDump* ProcessMemoryDump::CreateSharedGlobalAllocatorDump(
     const MemoryAllocatorDumpGuid& guid) {
   // A shared allocator dump can be shared within a process and the guid could
   // have been created already.
   MemoryAllocatorDump* allocator_dump = GetSharedGlobalAllocatorDump(guid);
   return allocator_dump ? allocator_dump
                         : CreateAllocatorDump(
                               GetSharedGlobalAllocatorDumpName(guid), guid);
 }
 
@@ skipping 86 matching lines @@
 
 void ProcessMemoryDump::AddSuballocation(const MemoryAllocatorDumpGuid& source,
                                          const std::string& target_node_name) {
   std::string child_mad_name = target_node_name + "/__" + source.ToString();
   MemoryAllocatorDump* target_child_mad = CreateAllocatorDump(child_mad_name);
   AddOwnershipEdge(source, target_child_mad->guid());
 }
 
 }  // namespace trace_event
 }  // namespace base