memory-infra: Add SUMMARY_ONLY MemoryDumpType

base/trace_event/memory_dump_request_args.h

Index: base/trace_event/memory_dump_request_args.h
diff --git a/base/trace_event/memory_dump_request_args.h b/base/trace_event/memory_dump_request_args.h
index 0f42a185310bf10ff68803f1aba29dc3dc44be2f..bc5cc38ecdb9ebd3ea90933928c5e88317d7786f 100644
--- a/base/trace_event/memory_dump_request_args.h
+++ b/base/trace_event/memory_dump_request_args.h
@@ -28,7 +28,8 @@ enum class MemoryDumpType {
   PERIODIC_INTERVAL,     // Dumping memory at periodic intervals.
   EXPLICITLY_TRIGGERED,  // Non maskable dump request.
   PEAK_MEMORY_USAGE,     // Dumping memory at detected peak total memory usage.
-  LAST = PEAK_MEMORY_USAGE  // For IPC macros.
+  SUMMARY_ONLY,          // Calculate just the summary & don't add to the trace.
+  LAST = SUMMARY_ONLY
 };
 
 // Tells the MemoryDumpProvider(s) how much detailed their dumps should be.