Mac: Add disable-scroll-bounce command-line flag (issue #1597).

patch/patches/spi_webcore_364.patch

@@ -1,34 +0,0 @@
-diff --git core/frame/FrameView.cpp core/frame/FrameView.cpp
-index b227b2a..3bc4180 100644
---- core/frame/FrameView.cpp
-+++ core/frame/FrameView.cpp
-@@ -144,8 +144,10 @@ FrameView::FrameView(LocalFrame* frame)
-     if (!m_frame->isMainFrame())
-         return;
- 
-+#if 0
-     ScrollableArea::setVerticalScrollElasticity(ScrollElasticityAllowed);
-     ScrollableArea::setHorizontalScrollElasticity(ScrollElasticityAllowed);
-+#endif
- }
- 
- PassRefPtrWillBeRawPtr<FrameView> FrameView::create(LocalFrame* frame)
-diff --git platform/scroll/ScrollbarThemeMacCommon.mm platform/scroll/ScrollbarThemeMacCommon.mm
-index 90abb7c..6bb16c6 100644
---- platform/scroll/ScrollbarThemeMacCommon.mm
-+++ platform/scroll/ScrollbarThemeMacCommon.mm
-@@ -354,10 +354,14 @@ NSScrollerStyle ScrollbarThemeMacCommon::recommendedScrollerStyle()
- // static
- bool ScrollbarThemeMacCommon::isOverlayAPIAvailable()
- {
-+#if 0
-     static bool apiAvailable =
-         [NSClassFromString(@"NSScrollerImp") respondsToSelector:@selector(scrollerImpWithStyle:controlSize:horizontal:replacingScrollerImp:)]
-         && [NSClassFromString(@"NSScrollerImpPair") instancesRespondToSelector:@selector(scrollerStyle)];
-     return apiAvailable;
-+#else
-+    return false;
-+#endif
- }
- 
- } // namespace blink