Reviewed by Maciej.

        <rdar://problem/4612079> need a way to prevent pages from scrolling to reveal elements that are focused
        by script

        * bridge/mac/WebCoreFrameBridge.h:
        * bridge/mac/WebCoreFrameBridge.mm:
        (-[WebCoreFrameBridge setProhibitsScrolling:]):
        * page/Frame.cpp:
        (WebCore::Frame::prohibitsScrolling):
        (WebCore::Frame::setProhibitsScrolling):
        * page/Frame.h:
        * page/FramePrivate.h:
        (WebCore::FramePrivate::FramePrivate):
        * page/FrameView.cpp:
        (WebCore::FrameView::scrollPointRecursively):
        (WebCore::FrameView::setContentsPos):
        * page/FrameView.h:
        * platform/ScrollView.h:

WebKit:

        Reviewed by Maciej.

        <rdar://problem/4612079> need a way to prevent pages from scrolling to reveal elements that are focused
        by script

        * WebView/WebViewPrivate.h:
        * WebView/WebView.m:
        (-[WebView setProhibitsMainFrameScrolling:]):
        New method.  Prohibits scrolling in the WebView's main frame.  Used to "lock" a WebView to a specific
        scroll position.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@15498 268f45cc-cd09-0410-ab3c-d52691b4dbfc