[memory-infra] Trigger first periodic dump after initial period

base/trace_event/memory_dump_scheduler.cc

Index: base/trace_event/memory_dump_scheduler.cc
diff --git a/base/trace_event/memory_dump_scheduler.cc b/base/trace_event/memory_dump_scheduler.cc
index 17921959d38fe7275a37c73341569a8ba1622548..b1d34d93403a5b6f9fd62b50ef3a3ff28454ef97 100644
--- a/base/trace_event/memory_dump_scheduler.cc
+++ b/base/trace_event/memory_dump_scheduler.cc
@@ -72,9 +72,12 @@ void MemoryDumpScheduler::StartInternal(MemoryDumpScheduler::Config config) {
   tick_count_ = 0;
   light_dump_rate_ = light_dump_period_ms / min_period_ms;
   heavy_dump_rate_ = heavy_dump_period_ms / min_period_ms;
-  SequencedTaskRunnerHandle::Get()->PostTask(
+
+  // Trigger the first dump after |period_ms_| and not as soon as timer starts.
+  SequencedTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE,
-      BindOnce(&MemoryDumpScheduler::Tick, Unretained(this), ++generation_));
+      BindOnce(&MemoryDumpScheduler::Tick, Unretained(this), ++generation_),
+      TimeDelta::FromMilliseconds(period_ms_));
 }
 
 void MemoryDumpScheduler::StopInternal() {