Early return in {Suspend,Resume}Renderer() if not backgrounded

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc

 // Copyright 2014 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 "platform/scheduler/renderer/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 531 matching lines @@
 
   MainThreadOnly().last_audio_state_change =
       helper_.scheduler_tqm_delegate()->NowTicks();
   MainThreadOnly().is_audio_playing = is_audio_playing;
 
   UpdatePolicy();
 }
 
 void RendererSchedulerImpl::SuspendRenderer() {
   helper_.CheckOnValidThread();
-  DCHECK(MainThreadOnly().renderer_backgrounded);
   if (helper_.IsShutdown())
     return;
+  if (!MainThreadOnly().renderer_backgrounded)
+    return;
   suspend_timers_when_backgrounded_closure_.Cancel();
 
   UMA_HISTOGRAM_COUNTS("PurgeAndSuspend.PendingTaskCount",
                        helper_.GetNumberOfPendingTasks());
 
   // TODO(hajimehoshi): We might need to suspend not only timer queue but also
   // e.g. loading tasks or postMessage.
   MainThreadOnly().renderer_suspended = true;
   SuspendTimerQueueWhenBackgrounded();
 }
 
 void RendererSchedulerImpl::ResumeRenderer() {
   helper_.CheckOnValidThread();
-  DCHECK(MainThreadOnly().renderer_backgrounded);
   if (helper_.IsShutdown())
     return;
+  if (!MainThreadOnly().renderer_backgrounded)
+    return;
   suspend_timers_when_backgrounded_closure_.Cancel();
   MainThreadOnly().renderer_suspended = false;
   ResumeTimerQueueWhenForegroundedOrResumed();
 }
 
 void RendererSchedulerImpl::EndIdlePeriod() {
   if (MainThreadOnly().in_idle_period_for_testing)
     return;
   TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"),
                "RendererSchedulerImpl::EndIdlePeriod");
@@ skipping 1288 matching lines @@
     case TimeDomainType::VIRTUAL:
       return "virtual";
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 }  // namespace scheduler
 }  // namespace blink