Validate finiteness of HTMLMediaElement properties.

Source/core/html/MediaController.h

Index: Source/core/html/MediaController.h
diff --git a/Source/core/html/MediaController.h b/Source/core/html/MediaController.h
index 484b37fc8f9fcf4576dbd32301d0a3ac6c782d8a..b610dcdf561abc6bb78f7e4a465f86aa63a0b873 100644
--- a/Source/core/html/MediaController.h
+++ b/Source/core/html/MediaController.h
@@ -67,10 +67,10 @@ public:
     void unpause();
 
     double defaultPlaybackRate() const { return m_defaultPlaybackRate; }
-    void setDefaultPlaybackRate(double);
+    void setDefaultPlaybackRate(double, ExceptionState&);
 
     double playbackRate() const;
-    void setPlaybackRate(double);
+    void setPlaybackRate(double, ExceptionState&);
 
     virtual double volume() const OVERRIDE { return m_volume; }
     virtual void setVolume(double, ExceptionState&) OVERRIDE;