Reland of Add process uptime metadata event in tracing

base/trace_event/memory_dump_scheduler.cc

 // Copyright 2017 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_scheduler.h"
 
 #include "base/process/process_metrics.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
@@ skipping 78 matching lines @@
   polling_state_.current_state = PollingTriggerState::ENABLED;
   polling_state_.ResetTotals();
 
   polling_state_.polling_task_runner->PostTask(
       FROM_HERE,
       Bind(&MemoryDumpScheduler::PollMemoryOnPollingThread, Unretained(this)));
 }
 
 void MemoryDumpScheduler::NotifyDumpTriggered() {
   if (polling_state_.polling_task_runner &&
-      polling_state_.polling_task_runner->RunsTasksOnCurrentThread()) {
+      !polling_state_.polling_task_runner->RunsTasksOnCurrentThread()) {
     polling_state_.polling_task_runner->PostTask(
         FROM_HERE,
         Bind(&MemoryDumpScheduler::NotifyDumpTriggered, Unretained(this)));
     return;
   }
   if (polling_state_.current_state != PollingTriggerState::ENABLED)
     return;
 
   polling_state_.ResetTotals();
 }
 
 void MemoryDumpScheduler::DisableAllTriggers() {
   if (periodic_state_.timer.IsRunning())
     periodic_state_.timer.Stop();
   DisablePolling();
 }
 
 void MemoryDumpScheduler::DisablePolling() {
-  if (polling_state_.polling_task_runner->RunsTasksOnCurrentThread()) {
+  if (!polling_state_.polling_task_runner->RunsTasksOnCurrentThread()) {
     if (polling_state_.polling_task_runner->PostTask(
             FROM_HERE,
             Bind(&MemoryDumpScheduler::DisablePolling, Unretained(this))))
       return;
   }
   polling_state_.current_state = PollingTriggerState::DISABLED;
   polling_state_.polling_task_runner = nullptr;
 }
 
 // static
@@ skipping 166 matching lines @@
         last_memory_totals_kb[last_memory_totals_kb_index] * 1024;
   }
   num_polls_from_last_dump = 0;
   for (uint32_t i = 0; i < kMaxNumMemorySamples; ++i)
     last_memory_totals_kb[i] = 0;
   last_memory_totals_kb_index = 0;
 }
 
 }  // namespace trace_event
 }  // namespace base