scheduler: Detect load RAIL mode

third_party/WebKit/public/platform/WebFrameScheduler.h

Index: third_party/WebKit/public/platform/WebFrameScheduler.h
diff --git a/third_party/WebKit/public/platform/WebFrameScheduler.h b/third_party/WebKit/public/platform/WebFrameScheduler.h
index d8be1dfebe62f6b88942e2bfe2f24d407dec5d7d..1228b392e6b81d9a7249fc3e529d8aa81dadeffb 100644
--- a/third_party/WebKit/public/platform/WebFrameScheduler.h
+++ b/third_party/WebKit/public/platform/WebFrameScheduler.h
@@ -63,6 +63,10 @@ class BLINK_PLATFORM_EXPORT WebFrameScheduler {
   // tells the scheduler not to advance virtual time if it's using the
   // DETERMINISTIC_LOADING policy.
   virtual void setDocumentParsingInBackground(bool) {}
+
+  // Tells the scheduler that the first meaningful paint has occured for this
+  // frame.
+  virtual void onFirstMeaningfulPaint() {}
 };
 
 }  // namespace blink