Defer suspend events on Android when audio is active.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 8132d91881c06d0bebedbc1b19d224585844c198..b0dc6a4872528ae75d10cdf972c4eb4a728dcc6e 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -30,6 +30,7 @@
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/persistent_histogram_allocator.h"
 #include "base/metrics/persistent_memory_allocator.h"
+#include "base/power_monitor/power_monitor.h"
 #include "base/process/process_handle.h"
 #include "base/rand_util.h"
 #include "base/single_thread_task_runner.h"
@@ -1438,6 +1439,7 @@ int RenderProcessHostImpl::VisibleWidgetCount() const {
 }
 
 void RenderProcessHostImpl::AudioStateChanged() {
+  LOG(ERROR) << __func__;
   UpdateProcessPriority();
 }
 
@@ -2752,6 +2754,12 @@ void RenderProcessHostImpl::UpdateProcessPriority() {
   // (http://crbug.com/398103).
   child_process_launcher_->SetProcessBackgrounded(should_background);
 
+#if defined(OS_ANDROID)
+  // Defer suspend events on Android if the scheduler says so; this ensures that
+  // functionality like background audio playback works properly.
+  base::PowerMonitor::Get()->DeferSuspendEvents(!should_background);
+#endif
+
   // Notify the child process of background state.
   Send(new ChildProcessMsg_SetProcessBackgrounded(should_background));
 }