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 17585ea1ba8ec0642985f696c4ec63f1a360c085..fe6f3a67346016be8c9e1530db59d00ee4e12385 100644
--- a/third_party/WebKit/public/platform/WebFrameScheduler.h
+++ b/third_party/WebKit/public/platform/WebFrameScheduler.h
@@ -67,6 +67,10 @@ 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