[Blink-Scheduler] Distinguish between normal and foreground-only renderers for monitoring load.

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index 0e554ba8467af157948ca32d042f7dbac426df8f..ea071c85ef3d027663bec0e59016fceae983ebf5 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -362,6 +362,9 @@ class CONTENT_EXPORT ContentRendererClient {
 
   // Returns true if the media pipeline can be suspended, or false otherwise.
   virtual bool AllowMediaSuspend();
+
+  // Returns true if this renderer can be backgrounded.
+  virtual bool CanBeBackgrounded() const;
 };
 
 }  // namespace content