Patch for https://bugs.webkit.org/show_bug.cgi?id=40940

Patch for https://bugs.webkit.org/show_bug.cgi?id=40940
Add message passing support to the WebKit2 API.

Reviewed by Anders Carlsson.

WebKit2:

Adds message passing for both InjectedBundle -> WebContext
and WebContext -> InjectedBundle.

* Shared/CoreIPCSupport/WebProcessMessageKinds.h:
(WebProcessMessage::):
* Shared/CoreIPCSupport/WebProcessProxyMessageKinds.h: Added.
(WebProcessProxyMessage::):
(CoreIPC::):
* UIProcess/API/C/WKContext.cpp:
(WKContextSetInjectedBundleClient):
(WKContextPostMessageToInjectedBundle):
* UIProcess/API/C/WKContext.h:
* UIProcess/WebContext.cpp:
(WebKit::WebContext::initializeInjectedBundleClient):
(WebKit::WebContext::forwardMessageToWebContext):
(WebKit::WebContext::postMessageToInjectedBundle):
* UIProcess/WebContext.h:
* UIProcess/WebContextInjectedBundleClient.cpp: Added.
(WebKit::WebContextInjectedBundleClient::WebContextInjectedBundleClient):
(WebKit::WebContextInjectedBundleClient::initialize):
(WebKit::WebContextInjectedBundleClient::didRecieveMessageFromInjectedBundle):
* UIProcess/WebContextInjectedBundleClient.h: Added.
* UIProcess/WebProcessManager.cpp:
(WebKit::WebProcessManager::processDidClose):
* UIProcess/WebProcessProxy.cpp:
(WebKit::WebProcessProxy::didReceiveInjectedBundleMessage):
(WebKit::WebProcessProxy::didReceiveMessage):
* UIProcess/WebProcessProxy.h:
* WebKit2.xcodeproj/project.pbxproj:
* WebProcess/InjectedBundle/API/c/WKBundle.cpp:
(WKBundlePostMessage):
* WebProcess/InjectedBundle/API/c/WKBundle.h:
* WebProcess/InjectedBundle/InjectedBundle.cpp:
(WebKit::InjectedBundle::postMessage):
(WebKit::InjectedBundle::didCreatePage):
(WebKit::InjectedBundle::didRecieveMessage):
* WebProcess/InjectedBundle/InjectedBundle.h:
* WebProcess/WebProcess.cpp:
(WebKit::WebProcess::loadInjectedBundle):
(WebKit::WebProcess::forwardMessageToInjectedBundle):
(WebKit::WebProcess::didReceiveMessage):
* WebProcess/WebProcess.h:
* mac/WebKit2.exp:
* win/WebKit2.vcproj:

WebKitTools:

- Add some test messages.

* MiniBrowser/mac/AppDelegate.m:
(_didRecieveMessageFromInjectedBundle):
(-[BrowserAppDelegate init]):
* MiniBrowser/mac/WebBundle/WebBundleMain.m:
(_didClearWindow):
(_didCreatePage):
(_didRecieveMessage):
(WKBundleInitialize):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@61579 268f45cc-cd09-0410-ab3c-d52691b4dbfc