[WK2][GTK] FullScreen signals

[WK2][GTK] FullScreen signals
https://bugs.webkit.org/show_bug.cgi?id=76166

Reviewed by Gustavo Noronha Silva.

* GNUmakefile.am: Add new files to compilation.
* UIProcess/API/C/gtk/WKFullScreenClientGtk.cpp:
(WKViewSetFullScreenClientGtk): Initialize WebKitWebViewBase
fullscreen client.
* UIProcess/API/C/gtk/WKFullScreenClientGtk.h:
* UIProcess/API/gtk/WebKitFullscreenClient.cpp: Added.
(willEnterFullScreen): Call webkitWebViewEnterFullScreen().
(willExitFullScreen): Call webkitWebViewLeaveFullScreen().
(attachFullScreenClientToView): Initialize FullScreenClient adding
implementations for willEnterFullScreen and willExitFullScreen callbacks.
* UIProcess/API/gtk/WebKitFullscreenClient.h: Added.
* UIProcess/API/gtk/WebKitPrivate.h:
* UIProcess/API/gtk/WebKitWebView.cpp:
(webkitWebViewConstructed): Attach fullscreen client to view.
(webkit_web_view_class_init): Add WebKitWebView::enter-fullscreen
and WebKitWebView::leave-fullscreen signals.
(webkitWebViewEnterFullScreen): Emit
WebKitWebView::enter-fullscreen signal.
(webkitWebViewLeaveFullScreen): Emit
WebKitWebView::leave-fullscreen signal.
* UIProcess/API/gtk/WebKitWebView.h:
* UIProcess/API/gtk/WebKitWebViewBase.cpp:
(webkitWebViewBaseKeyPressEvent): Only return early when leaving
fullscreen, otherwise let the view process the key pressed.
(webkitWebViewBaseEnterFullScreen): Return early if
willEnterFullScreen callback is handled and returns false.
(webkitWebViewBaseExitFullScreen): Return early if
willExitFullScreen callback is handled and returns false.
(webkitWebViewBaseInitializeFullScreenClient): Initialize the
fullscreen client.
* UIProcess/API/gtk/WebKitWebViewBasePrivate.h:
* UIProcess/API/gtk/WebKitWebViewPrivate.h:
* UIProcess/API/gtk/tests/TestWebKitWebView.cpp:
(testWebViewFullScreen):
(beforeAll):
* UIProcess/API/gtk/tests/WebViewTest.cpp:
(WebViewTest::keyStroke): Helper function to synthesize key
press/release events.
* UIProcess/API/gtk/tests/WebViewTest.h:
* UIProcess/API/gtk/webkit2marshal.list:
* UIProcess/gtk/WebFullScreenClientGtk.cpp:
(WebKit::WebFullScreenClientGtk::willEnterFullScreen): Call
willEnterFullScreen callback if defined.
(WebKit::WebFullScreenClientGtk::willExitFullScreen): Call
willExitFullScreen callback if defined.
* UIProcess/gtk/WebFullScreenClientGtk.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@113697 268f45cc-cd09-0410-ab3c-d52691b4dbfc