Add notification of the end of a rubber band.

Add notification of the end of a rubber band.
<rdar://problem/8940648>

Reviewed by Anders Carlsson.

Source/WebCore:

* WebCore.exp.in:
Add additional exprots.

* page/ChromeClient.h:
(WebCore::ChromeClient::didCompleteRubberBandForMainFrame):
* page/FrameView.cpp:
(WebCore::FrameView::didCompleteRubberBand):
* page/FrameView.h:
* platform/ScrollView.cpp:
(WebCore::ScrollView::didCompleteRubberBand):
* platform/ScrollView.h:
Add hook.

* platform/ScrollableArea.h:
(WebCore::ScrollableArea::inLiveResize):
(WebCore::ScrollableArea::maximumScrollPosition):
(WebCore::ScrollableArea::visibleWidth):
(WebCore::ScrollableArea::overhangAmount):
(WebCore::ScrollableArea::didCompleteRubberBand):
Reorganize and de-virtualize live resize notifications.

* platform/mac/ScrollAnimatorMac.mm:
(WebCore::ScrollAnimatorMac::snapRubberBandTimerFired):
Call the new hook when the rubberband ends.

Source/WebKit2:

* UIProcess/API/C/WKPage.h:
* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::drawHeader):
(WebKit::WebPageProxy::drawFooter):
(WebKit::WebPageProxy::didCompleteRubberBandForMainFrame):
* UIProcess/WebPageProxy.h:
* UIProcess/WebPageProxy.messages.in:
* UIProcess/WebUIClient.cpp:
(WebKit::WebUIClient::didCompleteRubberBandForMainFrame):
* UIProcess/WebUIClient.h:
* WebProcess/WebCoreSupport/WebChromeClient.cpp:
(WebKit::WebChromeClient::didCompleteRubberBandForMainFrame):
* WebProcess/WebCoreSupport/WebChromeClient.h:
Pipe the notification up to the WKUIClient.

Tools:

* MiniBrowser/mac/BrowserWindowController.m:
(-[BrowserWindowController awakeFromNib]):
* WebKitTestRunner/TestController.cpp:
(WTR::TestController::createOtherPage):
(WTR::TestController::initialize):
Stub out the new WKUIClient function.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@77509 268f45cc-cd09-0410-ab3c-d52691b4dbfc