[tracing] Introduce config to setup memory-infra peak detection

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::EXPLICITLY_TRIGGERED:
       return "explicitly_triggered";
+    case MemoryDumpType::PEAK_MEMORY_USAGE:
+      return "peak_memory_usage";
   }
   NOTREACHED();
   return "unknown";
 }
 
+MemoryDumpType StringToMemoryDumpType(const std::string& str) {
+  if (str == "periodic_interval")
+    return MemoryDumpType::PERIODIC_INTERVAL;
+  if (str == "explicitly_triggered")
+    return MemoryDumpType::EXPLICITLY_TRIGGERED;
+  if (str == "peak_memory_usage")
+    return MemoryDumpType::PEAK_MEMORY_USAGE;
+  NOTREACHED();
+  return MemoryDumpType::LAST;
+}
+
 const char* MemoryDumpLevelOfDetailToString(
     const MemoryDumpLevelOfDetail& level_of_detail) {
   switch (level_of_detail) {
     case MemoryDumpLevelOfDetail::BACKGROUND:
       return "background";
     case MemoryDumpLevelOfDetail::LIGHT:
       return "light";
     case MemoryDumpLevelOfDetail::DETAILED:
       return "detailed";
   }
   NOTREACHED();
   return "unknown";
 }
 
 MemoryDumpLevelOfDetail StringToMemoryDumpLevelOfDetail(
     const std::string& str) {
   if (str == "background")
     return MemoryDumpLevelOfDetail::BACKGROUND;
   if (str == "light")
     return MemoryDumpLevelOfDetail::LIGHT;
   if (str == "detailed")
     return MemoryDumpLevelOfDetail::DETAILED;
   NOTREACHED();
   return MemoryDumpLevelOfDetail::LAST;
 }
 
 }  // namespace trace_event
 }  // namespace base