Resume a backgrounded renderer that was purged and suspended

third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h

Index: third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h
diff --git a/third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h b/third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h
index 2a865e880158a249099df7e66d6f0d4474ae05f1..c6d3768f0cadd48c1dac05f30e90e2b2554a43ab 100644
--- a/third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h
+++ b/third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.h
@@ -132,6 +132,11 @@ class BLINK_PLATFORM_EXPORT RendererScheduler : public ChildScheduler {
   // automatically resumed when foregrounded.
   virtual void SuspendRenderer() = 0;
 
+  // Tells the scheduler that the render process should be resumed. This can
+  // only be done when the renderer is suspended. The renderer will be
+  // automatically suspended again if continuously backgrounded.
+  virtual void ResumeRenderer() = 0;
+
   // Tells the scheduler that a navigation task is pending. While any main-frame
   // navigation tasks are pending, the scheduler will ensure that loading tasks
   // are not blocked even if they are expensive. Must be called on the main