[tracing] Prevent memory maps dump for light dump requests

base/trace_event/process_memory_maps_dump_provider.cc

Index: base/trace_event/process_memory_maps_dump_provider.cc
diff --git a/base/trace_event/process_memory_maps_dump_provider.cc b/base/trace_event/process_memory_maps_dump_provider.cc
index 9c1bfcab8eccb91755707db140d6c534e9d8379b..750ca1119a4aa77aeea82b2cddb74d05127bb679 100644
--- a/base/trace_event/process_memory_maps_dump_provider.cc
+++ b/base/trace_event/process_memory_maps_dump_provider.cc
@@ -167,8 +167,9 @@ ProcessMemoryMapsDumpProvider::~ProcessMemoryMapsDumpProvider() {
 // the current process.
 bool ProcessMemoryMapsDumpProvider::OnMemoryDump(const MemoryDumpArgs& args,
                                                  ProcessMemoryDump* pmd) {
-  // TODO(ssid): Use MemoryDumpArgs to create light dumps when requested
-  // (crbug.com/499731).
+  // Snapshot of memory maps is not taken for light dump requests.
+  if (args.level_of_detail == MemoryDumpArgs::LEVEL_OF_DETAIL_LOW)
+    return true;
 
   uint32 res = 0;