[chromium] Improve fullscreen API
        https://bugs.webkit.org/show_bug.cgi?id=70477

        Reviewed by Adam Barth.

        Move fullscreen entry points from WebView to WebWidget since they are
        just about widget geometry.

        Delay webkitfullscreenchange event until we know that we have entered
        fullscreen mode.  This is accomplished by expanding the WebKit APIs to
        differentiate will{Enter,Exit} from did{Enter,Exit} state changes.

        WebViewImpl is forced to keep a reference to the requested fullscreen
        element while we are requesting to enter fullscreen mode.  Once in
        fullscreen mode, we switch to keeping only a reference to the Frame
        containing the fullscreen element, which we drop upon exiting
        fullscreen mode.

        * public/WebView.h:
        * public/WebViewClient.h:
        * public/WebWidget.h:
        (WebKit::WebWidget::willEnterFullScreen):
        (WebKit::WebWidget::didEnterFullScreen):
        (WebKit::WebWidget::willExitFullScreen):
        (WebKit::WebWidget::didExitFullScreen):
        * public/WebWidgetClient.h:
        (WebKit::WebWidgetClient::enterFullScreen):
        (WebKit::WebWidgetClient::exitFullScreen):
        * src/ChromeClientImpl.cpp:
        (WebKit::ChromeClientImpl::supportsFullscreenForNode):
        (WebKit::ChromeClientImpl::enterFullscreenForNode):
        (WebKit::ChromeClientImpl::exitFullscreenForNode):
        (WebKit::ChromeClientImpl::supportsFullScreenForElement):
        (WebKit::ChromeClientImpl::enterFullScreenForElement):
        (WebKit::ChromeClientImpl::exitFullScreenForElement):
        * src/WebViewImpl.cpp:
        (WebKit::WebViewImpl::willEnterFullScreen):
        (WebKit::WebViewImpl::didEnterFullScreen):
        (WebKit::WebViewImpl::willExitFullScreen):
        (WebKit::WebViewImpl::didExitFullScreen):
        (WebKit::WebViewImpl::enterFullScreenForElement):
        (WebKit::WebViewImpl::exitFullScreenForElement):
        * src/WebViewImpl.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@100821 268f45cc-cd09-0410-ab3c-d52691b4dbfc