Revert "Remove the HTMLVideoElement-specific prefixed fullscreen API"

Source/core/html/HTMLVideoElement.idl

Index: Source/core/html/HTMLVideoElement.idl
diff --git a/Source/core/html/HTMLVideoElement.idl b/Source/core/html/HTMLVideoElement.idl
index 2d196d365ec21b593f3b8d845d545378a1ee3b59..b68a7db0d85e27b4920ef98ae250f3d258bd2ea6 100644
--- a/Source/core/html/HTMLVideoElement.idl
+++ b/Source/core/html/HTMLVideoElement.idl
@@ -32,6 +32,16 @@
     readonly attribute unsigned long videoHeight;
     [Reflect, URL, PerWorldBindings, ActivityLogging=SetterForIsolatedWorlds] attribute DOMString poster;
 
+    [DeprecateAs=PrefixedVideoSupportsFullscreen] readonly attribute boolean webkitSupportsFullscreen;
+    [DeprecateAs=PrefixedVideoDisplayingFullscreen] readonly attribute boolean webkitDisplayingFullscreen;
+
+    [DeprecateAs=PrefixedVideoEnterFullscreen, RaisesException, PerWorldBindings, ActivityLogging=ForAllWorlds] void webkitEnterFullscreen();
+    [DeprecateAs=PrefixedVideoExitFullscreen] void webkitExitFullscreen();
+
+    // Note the different capitalization of the "S" in FullScreen.
+    [DeprecateAs=PrefixedVideoEnterFullScreen, ImplementedAs=webkitEnterFullscreen, RaisesException, PerWorldBindings, ActivityLogging=ForAllWorlds] void webkitEnterFullScreen();
+    [DeprecateAs=PrefixedVideoExitFullScreen, ImplementedAs=webkitExitFullscreen] void webkitExitFullScreen();
+
     // The number of frames that have been decoded and made available for
     // playback.
     [MeasureAs=PrefixedVideoDecodedFrameCount] readonly attribute unsigned long webkitDecodedFrameCount;