| Index: Source/core/frame/UseCounter.h | 
| diff --git a/Source/core/frame/UseCounter.h b/Source/core/frame/UseCounter.h | 
| index b01ef0723fab236a4f22fb93d160eda7e8e4d7ad..f23ee93e1dfd7d3fe4b9f240e2a1267516b93bc6 100644 | 
| --- a/Source/core/frame/UseCounter.h | 
| +++ b/Source/core/frame/UseCounter.h | 
| @@ -199,6 +199,12 @@ public: | 
| BeforeLoadEventInIsolatedWorld = 163, | 
| PrefixedAudioDecodedByteCount = 164, | 
| PrefixedVideoDecodedByteCount = 165, | 
| +        PrefixedVideoSupportsFullscreen = 166, | 
| +        PrefixedVideoDisplayingFullscreen = 167, | 
| +        PrefixedVideoEnterFullscreen = 168, | 
| +        PrefixedVideoExitFullscreen = 169, | 
| +        PrefixedVideoEnterFullScreen = 170, | 
| +        PrefixedVideoExitFullScreen = 171, | 
| PrefixedVideoDecodedFrameCount = 172, | 
| PrefixedVideoDroppedFrameCount = 173, | 
| PrefixedElementRequestFullscreen = 176, | 
|  |