Make it possible to override the tickmarks for a WebFrame.

Source/web/WebFrameImpl.cpp

Index: Source/web/WebFrameImpl.cpp
diff --git a/Source/web/WebFrameImpl.cpp b/Source/web/WebFrameImpl.cpp
index 3676b6fc189921e3255116f5e2e68e73b7437e22..8e7c9b4c8bf9edaf7f47f160eed7324cd26e5942 100644
--- a/Source/web/WebFrameImpl.cpp
+++ b/Source/web/WebFrameImpl.cpp
@@ -1935,6 +1935,17 @@ int WebFrameImpl::selectNearestFindMatch(const WebFloatPoint& point, WebRect* se
     return -1;
 }
 
+void WebFrameImpl::setTickmarks(const WebVector<WebRect>& tickmarks)
+{
+    if (frameView()) {
+        Vector<IntRect> tickmarksConverted(tickmarks.size());
+        for (size_t i = 0; i < tickmarks.size(); ++i)
+            tickmarksConverted[i] = tickmarks[i];
+        frameView()->setTickmarks(tickmarksConverted);
+        invalidateArea(InvalidateScrollbar);
+    }
+}
+
 int WebFrameImpl::nearestFindMatch(const FloatPoint& point, float& distanceSquared)
 {
     updateFindMatchRects();