https://bugs.webkit.org/show_bug.cgi?id=85827

Reviewed by Simon Hausmann.

Create a new experimental property to list URLs of JS scripts that should be
loaded when a page is loaded. These scripts will run in the normal JS environment
of the page.

The supported URL schemes are file:/// and qrc:///. The scripts are read from the
UI process and transfered to the Web process.

Together with the experimental messaging API this provides a way for the
application to manipulate the DOM (by injecting a script that does the
manipulation and communicating with it via postMessage). This covers some of the
use cases of QWebElement in our WK1 API.

* UIProcess/API/qt/qquickwebview.cpp:
(QQuickWebViewPrivate::didRelaunchProcess):
(readUserScript):
(QQuickWebViewPrivate::updateUserScripts):
(QQuickWebViewExperimental::userScripts):
(QQuickWebViewExperimental::setUserScripts):
* UIProcess/API/qt/qquickwebview_p.h:
* UIProcess/API/qt/qquickwebview_p_p.h:
(QQuickWebViewPrivate):
* UIProcess/API/qt/tests/qmltests/WebView.pro:
* UIProcess/API/qt/tests/qmltests/WebView/tst_userScripts.qml: Added.
* UIProcess/API/qt/tests/qmltests/common/append-document-title.js: Added.
* UIProcess/API/qt/tests/qmltests/common/big-user-script.js: Added.
* UIProcess/API/qt/tests/qmltests/common/change-document-title.js: Added.
* UIProcess/API/qt/tests/qmltests/resources.qrc: Added.
* UIProcess/WebPageProxy.h:
(WebPageProxy):
* UIProcess/qt/WebPageProxyQt.cpp:
(WebKit::WebPageProxy::setUserScripts):
(WebKit):
* WebProcess/WebPage/WebPage.h:
(WebPage):
* WebProcess/WebPage/WebPage.messages.in:
* WebProcess/WebPage/qt/WebPageQt.cpp:
(WebKit::WebPage::setUserScripts):
(WebKit):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@118756 268f45cc-cd09-0410-ab3c-d52691b4dbfc