https://bugs.webkit.org/show_bug.cgi?id=63706

Reviewed by Philippe Normand.

Source/WebCore:

* platform/DragData.h:
* platform/gtk/DataObjectGtk.cpp:
(WebCore::DataObjectGtk::text): Mark as const.
(WebCore::DataObjectGtk::markup): Ditto.
(WebCore::DataObjectGtk::urlLabel): Ditto.
* platform/gtk/DataObjectGtk.h: Remove unused member
m_dragContext.
(WebCore::DataObjectGtk::url): Mark as const.
(WebCore::DataObjectGtk::uriList): Ditto.
(WebCore::DataObjectGtk::filenames): Ditto.
(WebCore::DataObjectGtk::image): Ditto.
(WebCore::DataObjectGtk::hasText): Ditto.
(WebCore::DataObjectGtk::hasMarkup): Ditto.
(WebCore::DataObjectGtk::hasURIList): Ditto.
(WebCore::DataObjectGtk::hasURL): Ditto.
(WebCore::DataObjectGtk::hasFilenames): Ditto.
(WebCore::DataObjectGtk::hasImage): Ditto.
* platform/gtk/DragIcon.cpp: Added. A helper which takes care of
creating a transparent drag window for drags.
* platform/gtk/DragIcon.h: Added.

Source/WebKit2:

* GNUmakefile.am: Add new files to compilation.
* Shared/gtk/ArgumentCodersGtk.cpp: Added.
(CoreIPC::encodeImage): Encode a GdkPixbuf.
(CoreIPC::decodeImage): Decode a GdkPixbuf.
(CoreIPC::encodeDataObject): Encode a DataObjectGtk.
(CoreIPC::decodeDataObject): Decode a DataObjectGtk.
(CoreIPC::::encode): Encode DragData.
(CoreIPC::::decode): Decode DragData.
* Shared/gtk/ArgumentCodersGtk.h:
* UIProcess/API/gtk/PageClientImpl.cpp:
(WebKit::PageClientImpl::startDrag):
* UIProcess/API/gtk/PageClientImpl.h:
* UIProcess/API/gtk/WebKitWebViewBase.cpp:
(webkit_web_view_base_init): Set the view as a potential drop destination.
(webkitWebViewBaseDragDataGet): Added, delegate to GtkDragAndDropHelper.
(webkitWebViewBaseDragEnd): Ditto.
(webkitWebViewBaseDragDataReceived): Ditto.
(webkitWebViewBaseDragEnter): Ditto.
(webkitWebViewBaseDragMotion): Ditto.
(doDragLeaveLater): Ditto.
(webkitWebViewBaseDragLeave): Ditto.
(webkitWebViewBaseDragDrop): Ditto.
(webkit_web_view_base_class_init): Override GtkWidget drag and drop methods.
(webkitWebViewBaseStartDrag): Calls gtk_drag_begin() to start a drag operation.
* UIProcess/API/gtk/WebKitWebViewBasePrivate.h: Add webkitWebViewBaseStartDrag().
* UIProcess/PageClient.h: Add startDrag().
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::performDragControllerAction): Share the Qt version.
* UIProcess/WebPageProxy.h:
* UIProcess/WebPageProxy.messages.in:
* WebProcess/WebCoreSupport/WebDragClient.cpp:
* WebProcess/WebCoreSupport/gtk/WebDragClientGtk.cpp: Added.
* WebProcess/WebPage/WebPage.cpp: Add drag support for GTK+.
* WebProcess/WebPage/WebPage.h: Ditto.
* WebProcess/WebPage/WebPage.messages.in: Ditto.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@97012 268f45cc-cd09-0410-ab3c-d52691b4dbfc