Add UseCounters for prefixed HTMLVideoElement APIs

Source/core/html/HTMLVideoElement.h

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 #ifndef HTMLVideoElement_h
 #define HTMLVideoElement_h
 
 #include "core/html/HTMLMediaElement.h"
+#include "core/page/UseCounter.h"
 
 namespace WebCore {
 
 class ExceptionState;
 class HTMLImageLoader;
 
 class HTMLVideoElement FINAL : public HTMLMediaElement {
 public:
     static PassRefPtr<HTMLVideoElement> create(Document& document) { return create(HTMLNames::videoTag, document, false); }
     static PassRefPtr<HTMLVideoElement> create(const QualifiedName&, Document&, bool);
 
     unsigned width() const;
     unsigned height() const;
 
     unsigned videoWidth() const;
     unsigned videoHeight() const;
 
     // Fullscreen
-    void webkitEnterFullscreen(ExceptionState&);
-    void webkitExitFullscreen();
+    void webkitEnterFullscreen(ExceptionState&, UseCounter::Feature);
+    void webkitExitFullscreen(UseCounter::Feature);
+    void webkitEnterFullscreen(ExceptionState& es) { webkitEnterFullscreen(es, UseCounter::PrefixedVideoEnterFullscreen); }
+    void webkitExitFullscreen() { webkitExitFullscreen(UseCounter::PrefixedVideoExitFullscreen); }
     bool webkitSupportsFullscreen();
     bool webkitDisplayingFullscreen();
 
     // FIXME: Maintain "FullScreen" capitalization scheme for backwards compatibility.
     // https://bugs.webkit.org/show_bug.cgi?id=36081
-    void webkitEnterFullScreen(ExceptionState& es) { webkitEnterFullscreen(es); }
-    void webkitExitFullScreen() { webkitExitFullscreen(); }
+    void webkitEnterFullScreen(ExceptionState& es) { webkitEnterFullscreen(es, UseCounter::PrefixedVideoEnterFullScreen); }
+    void webkitExitFullScreen() { webkitExitFullscreen(UseCounter::PrefixedVideoExitFullScreen); }
 
     // Statistics
     unsigned webkitDecodedFrameCount() const;
     unsigned webkitDroppedFrameCount() const;
 
     // Used by canvas to gain raw pixel access
     void paintCurrentFrameInContext(GraphicsContext*, const IntRect&);
 
     // Used by WebGL to do GPU-GPU textures copy if possible.
     // See more details at MediaPlayer::copyVideoTextureToPlatformTexture() defined in Source/WebCore/platform/graphics/MediaPlayer.h.
@@ skipping 40 matching lines @@
 
 inline HTMLVideoElement* toHTMLVideoElement(Node* node)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLVideoElement(node));
     return static_cast<HTMLVideoElement*>(node);
 }
 
 } //namespace
 
 #endif