Support earliest seekable time in WMPI.

content/renderer/media/android/webmediaplayer_android.h

Index: content/renderer/media/android/webmediaplayer_android.h
diff --git a/content/renderer/media/android/webmediaplayer_android.h b/content/renderer/media/android/webmediaplayer_android.h
index bb338153f8fac37a3809049b86557513c440d313..6c50c3f0b236b0ed6cd419212b864f79291befeb 100644
--- a/content/renderer/media/android/webmediaplayer_android.h
+++ b/content/renderer/media/android/webmediaplayer_android.h
@@ -154,11 +154,12 @@ class WebMediaPlayerAndroid : public blink::WebMediaPlayer,
   virtual blink::WebSize naturalSize() const;
 
   // Getters of playback state.
-  virtual bool paused() const;
-  virtual bool seeking() const;
-  virtual double duration() const;
-  virtual double timelineOffset() const;
-  virtual double currentTime() const;
+  bool paused() const override;
+  bool seeking() const override;
+  double earliestTime() const override;
+  double duration() const override;
+  virtual timelineOffset() const;
+  double currentTime() const override;
 
   virtual bool didLoadingProgress();