Part of <rdar://problem/8255932>
https://bugs.webkit.org/show_bug.cgi?id=43947

Reviewed by Jon Honeycutt.

* Shared/APIObject.h:
Add TypeFormSubmissionListener APIType.
        
* Shared/CoreIPCSupport/WebPageProxyMessageKinds.h:
Add WillSubmitForm message kind.

* UIProcess/API/C/WKAPICast.h:
Add new mappings for WKFormSubmissionListenerRef -> WebFormSubmissionListener

* UIProcess/API/C/WKBase.h:
Add OpaqueWKFormSubmissionListener and rename the other opaque types to match.

* UIProcess/API/C/WKFormSubmissionListener.cpp: Added.
(WKFormSubmissionListenerGetTypeID):
(WKFormSubmissionListenerContinue):
(WKFormSubmissionListenerRetain):
(WKFormSubmissionListenerRelease):
* UIProcess/API/C/WKFormSubmissionListener.h: Added.
Add C wrapper for WebFormSubmissionListener.

* UIProcess/API/C/WKPage.cpp:
(WKPageSetPageFormClient):
* UIProcess/API/C/WKPage.h:
Add WKPageFormClient with willSubmitForm callback. Additional callbacks will be added as
needed.

* UIProcess/API/C/WebKit2.h:
Add include for WKFormSubmissionListener.h

* UIProcess/WebFormClient.cpp: Added.
(WebKit::WebFormClient::WebFormClient):
(WebKit::WebFormClient::initialize):
(WebKit::WebFormClient::willSubmitForm):
* UIProcess/WebFormClient.h: Added.
Add client for form related delagations.

* UIProcess/WebFormSubmissionListenerProxy.cpp: Added.
(WebKit::WebFormSubmissionListenerProxy::WebFormSubmissionListenerProxy):
(WebKit::WebFormSubmissionListenerProxy::continueSubmission):
* UIProcess/WebFormSubmissionListenerProxy.h: Added.
(WebKit::WebFormSubmissionListenerProxy::create):
(WebKit::WebFormSubmissionListenerProxy::type):
* UIProcess/WebFrameListenerProxy.cpp: Copied from UIProcess/WebFramePolicyListenerProxy.cpp.
Add new type of listener for form submissions. It inherits from the new base class
for listeners, WebFrameListenerProxy.

(WebKit::WebFrameListenerProxy::WebFrameListenerProxy):
(WebKit::WebFrameListenerProxy::~WebFrameListenerProxy):
(WebKit::WebFrameListenerProxy::invalidate):
(WebKit::WebFrameListenerProxy::receivedPolicyDecision):
* UIProcess/WebFrameListenerProxy.h: Copied from UIProcess/WebFramePolicyListenerProxy.h.
Move logic that would have to be shared between WebFramePolicyListenerProxy and
WebFormSubmissionListenerProxy into shared base class.

* UIProcess/WebFramePolicyListenerProxy.cpp:
(WebKit::WebFramePolicyListenerProxy::WebFramePolicyListenerProxy):
* UIProcess/WebFramePolicyListenerProxy.h:
(WebKit::WebFramePolicyListenerProxy::create):
(WebKit::WebFramePolicyListenerProxy::type):
Move to inheriting from WebFrameListenerProxy.

* UIProcess/WebFrameProxy.cpp:
(WebKit::WebFrameProxy::disconnect):
(WebKit::WebFrameProxy::receivedPolicyDecision):
(WebKit::WebFrameProxy::setUpPolicyListenerProxy):
(WebKit::WebFrameProxy::setUpFormSubmissionListenerProxy):
* UIProcess/WebFrameProxy.h:
Change listener functions to act on WebFrameListenerProxys and add setUpFormSubmissionListenerProxy.

* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::initializeFormClient):
(WebKit::WebPageProxy::didReceiveMessage):
(WebKit::WebPageProxy::willSubmitForm):
* UIProcess/WebPageProxy.h:
Plumb through willSubmitForm call as we do with the other listeners.

* WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp:
(WebKit::WebFrameLoaderClient::dispatchWillSubmitForm):
Ditto.

* WebKit2.xcodeproj/project.pbxproj: Add new files.
* win/WebKit2.vcproj: Add new files.
* win/WebKit2Generated.make: Ditto.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@65337 268f45cc-cd09-0410-ab3c-d52691b4dbfc