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

base/trace_event/memory_dump_session_state.cc

Index: base/trace_event/memory_dump_session_state.cc
diff --git a/base/trace_event/memory_dump_session_state.cc b/base/trace_event/memory_dump_session_state.cc
index b3d9a8ccfc8ff765e6b9c0e69ee18f1a6bd387f1..3e3bedbb2989b382dab7c85cc002dbc4f4287b64 100644
--- a/base/trace_event/memory_dump_session_state.cc
+++ b/base/trace_event/memory_dump_session_state.cc
@@ -7,7 +7,7 @@
 namespace base {
 namespace trace_event {
 
-MemoryDumpSessionState::MemoryDumpSessionState() {}
+MemoryDumpSessionState::MemoryDumpSessionState() : is_polling_enabled_(false) {}
 
 MemoryDumpSessionState::~MemoryDumpSessionState() {}
 
@@ -26,6 +26,10 @@ void MemoryDumpSessionState::SetTypeNameDeduplicator(
 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