[tracing] Add graphics memory dump provider for Android

base/trace_event/process_memory_dump.cc

Index: base/trace_event/process_memory_dump.cc
diff --git a/base/trace_event/process_memory_dump.cc b/base/trace_event/process_memory_dump.cc
index 67118f10e8c0604d6586b0c54e29497ef08c2242..df26ef5993fcd6736ee547c8ac6928fdc0fea156 100644
--- a/base/trace_event/process_memory_dump.cc
+++ b/base/trace_event/process_memory_dump.cc
@@ -56,6 +56,14 @@ MemoryAllocatorDump* ProcessMemoryDump::GetAllocatorDump(
   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