Support earliest seekable time in WMPI.

third_party/WebKit/Source/core/html/shadow/MediaControlElements.h

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 134 matching lines @@
 };
 
 // ----------------------------
 
 class MediaControlTimelineElement final : public MediaControlInputElement {
 public:
     static PassRefPtrWillBeRawPtr<MediaControlTimelineElement> create(MediaControls&);
 
     bool willRespondToMouseClickEvents() override;
 
-    // FIXME: An "earliest possible position" will be needed once that concept
-    // is supported by HTMLMediaElement, see https://crbug.com/137275
+    void setEarliestPosition(double);
     void setPosition(double);
     void setDuration(double);
 
 private:
     explicit MediaControlTimelineElement(MediaControls&);
 
     void defaultEventHandler(Event*) override;
     bool keepEventInNode(Event*) override;
 };
 
@@ skipping 85 matching lines @@
 public:
     static PassRefPtrWillBeRawPtr<MediaControlCurrentTimeDisplayElement> create(MediaControls&);
 
 private:
     explicit MediaControlCurrentTimeDisplayElement(MediaControls&);
 };
 
 } // namespace blink
 
 #endif // MediaControlElements_h