https://bugs.webkit.org/show_bug.cgi?id=52775
<rdar://problem/8514409>
        
Reviewed by Darin Adler and Adam Roben.

On Windows the access to the content being dragged is
provided via the IDataObject interface that is made available
to the window that registers itself as drop target.
Since this interface cannot be accessed from the WebProcess,
in every call to one of the methods of the IDropTarget interface
we serialize the content of the drag clipboard and send it over to
the WebProcess.
The bulk of this patch consists in the refactoring needed in DragData
and ClipboardWin classes to extract the data from the serialized object.
        
* platform/DragData.cpp:
* platform/DragData.h:
* platform/win/ClipboardUtilitiesWin.cpp:
(WebCore::getWebLocData):
(WebCore::getURL):
(WebCore::getPlainText):
(WebCore::getTextHTML):
(WebCore::getCFHTML):
(WebCore::fragmentFromFilenames):
(WebCore::containsFilenames):
(WebCore::fragmentFromHTML):
(WebCore::containsHTML):
(WebCore::getClipboardData):
* platform/win/ClipboardUtilitiesWin.h:
* platform/win/ClipboardWin.cpp:
(WebCore::Clipboard::create):
(WebCore::ClipboardWin::ClipboardWin):
(WebCore::ClipboardWin::getData):
(WebCore::ClipboardWin::types):
(WebCore::ClipboardWin::files):
(WebCore::ClipboardWin::hasData):
* platform/win/ClipboardWin.h:
(WebCore::ClipboardWin::create):
* platform/win/DragDataWin.cpp:
(WebCore::DragData::DragData):
(WebCore::DragData::containsURL):
(WebCore::DragData::dragDataMap):
(WebCore::DragData::asURL):
(WebCore::DragData::containsFiles):
(WebCore::DragData::asFilenames):
(WebCore::DragData::containsPlainText):
(WebCore::DragData::asPlainText):
(WebCore::DragData::canSmartReplace):
(WebCore::DragData::containsCompatibleContent):
(WebCore::DragData::asFragment):

Source/WebKit2: WebKit2: add support for drag and drop on Windows
https://bugs.webkit.org/show_bug.cgi?id=52775
<rdar://problem/8514409>

Reviewed by Darin Adler and Adam Roben.

On Windows the access to the content being dragged is
provided via the IDataObject interface that is made available
to the window that registers itself as drop target.
Since this interface cannot be accessed from the WebProcess,
in every call to one of the methods of the IDropTarget interface
we serialize the content of the drag clipboard and send it over to
the WebProcess. The implementation uses the same messages as the
Mac one, with slightly different parameters to pass the serialized
clipboard.

* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::performDragControllerAction): Added Windows
specific implementation.
* UIProcess/WebPageProxy.h:
* UIProcess/win/WebView.cpp:
(WebKit::WebView::WebView): Added dropTargetHelper object creation.
(WebKit::WebView::initialize): Added to register for drag/drop with out
refcount issues.
(WebKit::WebView::close):
(WebKit::WebView::windowReceivedMessage):
(WebKit::WebView::QueryInterface):
(WebKit::WebView::AddRef):
(WebKit::WebView::Release):
(WebKit::dragOperationToDragCursor):
(WebKit::WebView::keyStateToDragOperation):
(WebKit::WebView::DragEnter):
(WebKit::WebView::DragOver):
(WebKit::WebView::DragLeave):
(WebKit::WebView::Drop):
* UIProcess/win/WebView.h:
(WebKit::WebView::create):
* WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::performDragControllerAction):
* WebProcess/WebPage/WebPage.h:
* WebProcess/WebPage/WebPage.messages.in:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@76824 268f45cc-cd09-0410-ab3c-d52691b4dbfc