Defer suspend events on Android when audio is active.

base/power_monitor/power_monitor.h

Index: base/power_monitor/power_monitor.h
diff --git a/base/power_monitor/power_monitor.h b/base/power_monitor/power_monitor.h
index e025b324011b4420750bdbf53744bf04ccab62c9..36991b11efba800f5e1700c2823fc0131b5c9cf0 100644
--- a/base/power_monitor/power_monitor.h
+++ b/base/power_monitor/power_monitor.h
@@ -10,6 +10,11 @@
 #include "base/memory/ref_counted.h"
 #include "base/observer_list_threadsafe.h"
 #include "base/power_monitor/power_observer.h"
+#include "build/build_config.h"
+
+#if defined(OS_ANDROID)
+#include "base/synchronization/lock.h"
+#endif
 
 namespace base {
 
@@ -35,6 +40,10 @@ class BASE_EXPORT PowerMonitor {
   // Is the computer currently on battery power.
   bool IsOnBatteryPower();
 
+#if defined(OS_ANDROID)
+  void DeferSuspendEvents(bool defer);
+#endif
+
  private:
   friend class PowerMonitorSource;
 
@@ -47,6 +56,10 @@ class BASE_EXPORT PowerMonitor {
   scoped_refptr<ObserverListThreadSafe<PowerObserver> > observers_;
   std::unique_ptr<PowerMonitorSource> source_;
 
+  base::Lock lock_;
+  bool is_suspended_ = false;
+  bool should_defer_suspend_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(PowerMonitor);
 };