[memory-infra] Add support for polling memory totals in MemoryDumpManager

base/trace_event/memory_dump_session_state.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_session_state.h"
 
 namespace base {
 namespace trace_event {
 
-MemoryDumpSessionState::MemoryDumpSessionState() {}
+MemoryDumpSessionState::MemoryDumpSessionState() : is_polling_enabled_(false) {}
 
 MemoryDumpSessionState::~MemoryDumpSessionState() {}
 
 void MemoryDumpSessionState::SetStackFrameDeduplicator(
     std::unique_ptr<StackFrameDeduplicator> stack_frame_deduplicator) {
   DCHECK(!stack_frame_deduplicator_);
   stack_frame_deduplicator_ = std::move(stack_frame_deduplicator);
 }
 
 void MemoryDumpSessionState::SetTypeNameDeduplicator(
     std::unique_ptr<TypeNameDeduplicator> type_name_deduplicator) {
   DCHECK(!type_name_deduplicator_);
   type_name_deduplicator_ = std::move(type_name_deduplicator);
 }
 
 void MemoryDumpSessionState::SetMemoryDumpConfig(
     const TraceConfig::MemoryDumpConfig& config) {
   memory_dump_config_ = config;
+  for (const auto& trigger : config.triggers) {
+    if (trigger.trigger_type == MemoryDumpType::PEAK_MEMORY_USAGE)
+      is_polling_enabled_ = true;
+  }
 }
 
 }  // namespace trace_event
 }  // namespace base