https://bugs.webkit.org/show_bug.cgi?id=49213

Reviewed by Adam Roben.

* DerivedSources.make:
* DerivedSources.pro:
Add Download.messages.in.

* Platform/CoreIPC/MessageID.h:
Add MessageClassDownloadProxy message class.

* Platform/CoreIPC/MessageSender.h:
Include Connection.h directly since it's required.

* UIProcess/Downloads/DownloadProxy.cpp:
(WebKit::DownloadProxy::didBegin):
(WebKit::DownloadProxy::didCreateDestination):
(WebKit::DownloadProxy::didFinish):
Add stubs.

* UIProcess/Downloads/DownloadProxy.messages.in: Added.

* UIProcess/WebContext.cpp:
(WebKit::WebContext::didReceiveMessage):
Handle DownloadProxy messages.

* UIProcess/WebProcessProxy.cpp:
(WebKit::WebProcessProxy::didReceiveMessage):
Hand DownloadProxy messages off to the context.

* WebKit2.pro:
* WebKit2.xcodeproj/project.pbxproj:
Add new files.

* WebProcess/Downloads/Download.cpp:
(WebKit::Download::didBegin):
(WebKit::Download::didReceiveData):
(WebKit::Download::didCreateDestination):
(WebKit::Download::didFinish):
Send messages.

* WebProcess/Downloads/mac/DownloadMac.mm:
(-[WKDownloadAsDelegate download:didCreateDestination:]):
Call Download::didCreateDestination.

* win/WebKit2.vcproj:
Add new files.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@71581 268f45cc-cd09-0410-ab3c-d52691b4dbfc