[tracing] Reland of Throttle rate of heavy dumps and support to request light/heavy dumps

base/trace_event/memory_dump_request_args.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/memory_dump_request_args.h"
 
 #include "base/logging.h"
 
 namespace base {
 namespace trace_event {
 
 // static
 const char* MemoryDumpTypeToString(
     const MemoryDumpType& dump_type) {
   switch (dump_type) {
     case MemoryDumpType::TASK_BEGIN:
       return "TASK_BEGIN";
     case MemoryDumpType::TASK_END:
       return "TASK_END";
     case MemoryDumpType::PERIODIC_INTERVAL:
       return "PERIODIC_INTERVAL";
-    case MemoryDumpType::PERIODIC_INTERVAL_WITH_MMAPS:
-      return "PERIODIC_INTERVAL_WITH_MMAPS";
     case MemoryDumpType::EXPLICITLY_TRIGGERED:
       return "EXPLICITLY_TRIGGERED";
   }
   NOTREACHED();
   return "UNKNOWN";
 }
 
 }  // namespace trace_event
 }  // namespace base