[tracing] Disable memory maps dump provider for security reason

base/trace_event/memory_dump_manager.cc

Index: base/trace_event/memory_dump_manager.cc
diff --git a/base/trace_event/memory_dump_manager.cc b/base/trace_event/memory_dump_manager.cc
index f76ac55a69bdacc58dabb4d1af8113687c968a52..bafd121af1e461cc246c3664d6b269079c9b752d 100644
--- a/base/trace_event/memory_dump_manager.cc
+++ b/base/trace_event/memory_dump_manager.cc
@@ -119,7 +119,14 @@ void MemoryDumpManager::Initialize() {
 #endif
 
 #if defined(OS_LINUX) || defined(OS_ANDROID)
-  RegisterDumpProvider(ProcessMemoryMapsDumpProvider::GetInstance());
+  // The memory maps dump provider is currently disabled for security reasons
+  // and will be enabled once tracing is more secure (crbug.com/517906).
+  // It is still enabled for running benchmarks.
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          "enable-memory-benchmarking")) {
+    RegisterDumpProvider(ProcessMemoryMapsDumpProvider::GetInstance());
+  }
+
   RegisterDumpProvider(MallocDumpProvider::GetInstance());
   system_allocator_pool_name_ = MallocDumpProvider::kAllocatedObjects;
 #endif