https://bugs.webkit.org/show_bug.cgi?id=107852

Reviewed by Anders Carlsson.

Source/WebKit2:

Hook up three new methods: plugInStartLabelTitle, plugInStartLabelSubtitle and
plugInExtraStyleSheet to allow some custom styling and content to come
from the InjectedBundle.

* WebProcess/InjectedBundle/API/c/WKBundlePage.h: Callbacks added to
WKBundlePageUIClient structure.
* WebProcess/InjectedBundle/InjectedBundlePageUIClient.cpp: Stub implementations
of the three new methods.
(WebKit::InjectedBundlePageUIClient::plugInStartLabelTitle):
(WebKit::InjectedBundlePageUIClient::plugInStartLabelSubtitle):
(WebKit::InjectedBundlePageUIClient::plugInExtraStyleSheet):
* WebProcess/InjectedBundle/InjectedBundlePageUIClient.h:
(InjectedBundlePageUIClient):
* WebProcess/WebCoreSupport/WebChromeClient.cpp: Call into the injected bundle
for each of these methods.
(WebKit::WebChromeClient::plugInStartLabelTitle):
(WebKit::WebChromeClient::plugInStartLabelSubtitle):
(WebKit::WebChromeClient::plugInExtraStyleSheet):
* WebProcess/WebCoreSupport/WebChromeClient.h:
(WebChromeClient): Declare the virtual methods in the Chrome
Client so that they can accessed from WebCore eventually.

Tools:

Null implementations of plugInStartLabelTitle, plugInStartLabelSubtitle and
plugInExtraStyleSheet.

* WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp:
(WTR::InjectedBundlePage::InjectedBundlePage):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140713 268f45cc-cd09-0410-ab3c-d52691b4dbfc