Context menu support for WebKit 2.

Reviewed by Anders Carlsson.

WebCore: 

Add a "showContextMenu" call to Chrome/ChromeClient:
* loader/EmptyClients.h:
(WebCore::EmptyChromeClient::showContextMenu):
* page/Chrome.cpp:
(WebCore::Chrome::showContextMenu):
* page/Chrome.h:
* page/ChromeClient.h:

Add a "platform description to ContextMenuItem" creator, will be needed by WebKit2
* platform/ContextMenu.h:
* platform/mac/ContextMenuMac.mm:
(WebCore::contextMenuItemVector):

* platform/mac/ContextMenuItemMac.mm:
(WebCore::ContextMenuItem::checked): WebKit2 ports now need this implemented.

Stub these out to keep their WK2 ports building:
* platform/qt/ContextMenuItemQt.cpp:
(WebCore::ContextMenuItem::checked):
* platform/qt/ContextMenuQt.cpp:
(WebCore::contextMenuItemVector):
* platform/win/ContextMenuItemWin.cpp:
(WebCore::ContextMenuItem::checked):
* platform/win/ContextMenuWin.cpp:
(WebCore::contextMenuItemVector):

WebKit/chromium: 

* src/ChromeClientImpl.h:
(WebKit::ChromeClientImpl::showContextMenu):

WebKit/efl: 

* WebCoreSupport/ChromeClientEfl.h:
(WebCore::ChromeClientEfl::showContextMenu):

WebKit/gtk: 

* WebCoreSupport/ChromeClientGtk.h:
(WebKit::ChromeClient::showContextMenu):

WebKit/haiku: 

* WebCoreSupport/ChromeClientHaiku.h:
(WebCore::ChromeClientHaiku::showContextMenu):

WebKit/mac: 

* WebCoreSupport/WebChromeClient.h:
(WebChromeClient::showContextMenu):

WebKit/qt: 

* WebCoreSupport/ChromeClientQt.h:
(WebCore::ChromeClientQt::showContextMenu):

WebKit/win: 

* WebCoreSupport/WebChromeClient.h:
(WebChromeClient::showContextMenu):

WebKit/wx: 

* WebKitSupport/ChromeClientWx.h:
(WebCore::ChromeClientWx::showContextMenu):

WebKit2: 

* WebKit2.pro:
* WebKit2.xcodeproj/project.pbxproj:
* win/WebKit2.vcproj:

* Shared/WebContextMenuItem.cpp: Added.
(WebKit::WebContextMenuItem::WebContextMenuItem):
(WebKit::WebContextMenuItem::encode):
(WebKit::WebContextMenuItem::decode):
(WebKit::kitItems):
* Shared/WebContextMenuItem.h: Added.

* UIProcess/API/mac/PageClientImpl.h:
* UIProcess/API/mac/PageClientImpl.mm:
(WebKit::PageClientImpl::createContextMenuProxy):
* UIProcess/API/qt/qwkpage.cpp:
(QWKPagePrivate::createContextMenuProxy): Stub to keep the build working.
* UIProcess/API/qt/qwkpage_p.h:
* UIProcess/PageClient.h:

* UIProcess/WebContextMenuProxy.cpp: Added.
(WebKit::WebContextMenuProxy::~WebContextMenuProxy):
(WebKit::WebContextMenuProxy::WebContextMenuProxy):
* UIProcess/WebContextMenuProxy.h: Added.

* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::showContextMenu): Shows the menu after receiving the message from the WebProcess.
(WebKit::WebPageProxy::contextMenuItemSelected): Sends info about the selected menu item to the WebProcess
* UIProcess/WebPageProxy.h:
* UIProcess/WebPageProxy.messages.in:

* UIProcess/mac/WebContextMenuProxyMac.h: Added.
(WebKit::WebContextMenuProxyMac::create):
* UIProcess/mac/WebContextMenuProxyMac.mm: Added.
(+[WebMenuTarget sharedMenuTarget]):
(-[WebMenuTarget WebKit::]):
(-[WebMenuTarget setMenuProxy:WebKit::]):
(-[WebMenuTarget forwardContextMenuAction:]):
(WebKit::WebContextMenuProxyMac::WebContextMenuProxyMac):
(WebKit::WebContextMenuProxyMac::~WebContextMenuProxyMac):
(WebKit::WebContextMenuProxyMac::contextMenuItemSelected):
(WebKit::populateNSMenu):
(WebKit::nsMenuItemVector):
(WebKit::WebContextMenuProxyMac::populate):
(WebKit::WebContextMenuProxyMac::showContextMenu):
(WebKit::WebContextMenuProxyMac::hideContextMenu):

* UIProcess/win/WebView.cpp:
(WebKit::WebView::createContextMenuProxy): Stub for now.
* UIProcess/win/WebView.h:

* WebProcess/WebCoreSupport/WebChromeClient.cpp:
(WebKit::WebChromeClient::showContextMenu):
* WebProcess/WebCoreSupport/WebChromeClient.h:

* WebProcess/WebCoreSupport/WebContextMenuClient.cpp:
(WebKit::WebContextMenuClient::getCustomMenuFromDefaultItems): Return the WebCore-provided default
  menu for now. Embedding app customization will come later (see bug 48720)

* WebProcess/WebPage/WebContextMenu.cpp: Added.
(WebKit::WebContextMenu::WebContextMenu):
(WebKit::WebContextMenu::~WebContextMenu):
(WebKit::WebContextMenu::show):
(WebKit::WebContextMenu::itemSelected):
* WebProcess/WebPage/WebContextMenu.h: Added.
(WebKit::WebContextMenu::create):

* WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::contextMenu):
(WebKit::handleMouseEvent): Pass right mouse presses along to WebCore as both a mouse event and context menu event, 
  the same way WebKit1 does.
(WebKit::WebPage::didSelectItemFromActiveContextMenu):
* WebProcess/WebPage/WebPage.h:
* WebProcess/WebPage/WebPage.messages.in:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@71041 268f45cc-cd09-0410-ab3c-d52691b4dbfc