<rdar://problem/11027997> and https://bugs.webkit.org/show_bug.cgi?id=81412 REGRESSION (r107435) Copy a link and paste to Mail: Nothing is pasted

Reviewed by Geoff Garen.

Source/WebCore:

WebKit API test WebViewCanPasteURL.mm added.

* WebCore.exp.in:

Add a strategy method specifically for getting the URL:
* platform/PasteboardStrategy.h:

Use that strategy method when creating the fragment for a URL:
* platform/mac/PasteboardMac.mm:
(WebCore::Pasteboard::documentFragment):

Add a platform pasteboard accessor to "do the right thing" for getting a URL:
* platform/PlatformPasteboard.h:
* platform/mac/PlatformPasteboardMac.mm:
(WebCore::PlatformPasteboard::url):

Source/WebKit/mac:

* WebCoreSupport/WebEditorClient.mm:
(WebEditorClient::setInsertionPasteboard):
* WebCoreSupport/WebPlatformStrategies.h:
(WebPlatformStrategies):
* WebCoreSupport/WebPlatformStrategies.mm:
(WebPlatformStrategies::url):

Source/WebKit2:

Add new message so the WebProcess can ask the UIProcesses pasteboard for the URL:
* UIProcess/WebContext.h:
* UIProcess/WebContext.messages.in:
* UIProcess/mac/WebContextMac.mm:
(WebKit::WebContext::getPasteboardURL):

Use that new message to implement the pasteboard strategy:
* WebProcess/WebCoreSupport/WebPlatformStrategies.cpp:
(WebKit::WebPlatformStrategies::url):
* WebProcess/WebCoreSupport/WebPlatformStrategies.h:
(WebPlatformStrategies):

Tools:

* TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj:
* TestWebKitAPI/Tests/mac/WebViewCanPasteURL.mm: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@111080 268f45cc-cd09-0410-ab3c-d52691b4dbfc