On some webpages, touch scrolling speed is too slow / fast

LayoutTests/fast/events/touch/gesture/gesture-scroll-zoomed.html

Index: LayoutTests/fast/events/touch/gesture/gesture-scroll-zoomed.html
diff --git a/LayoutTests/fast/events/touch/gesture/gesture-scroll.html b/LayoutTests/fast/events/touch/gesture/gesture-scroll-zoomed.html
similarity index 87%
copy from LayoutTests/fast/events/touch/gesture/gesture-scroll.html
copy to LayoutTests/fast/events/touch/gesture/gesture-scroll-zoomed.html
index 0c388b94470d953346e2046e8beeaf327b105ba4..23ab651cbcdfd4d3b84a1155984bf5f86e014ea0 100644
--- a/LayoutTests/fast/events/touch/gesture/gesture-scroll.html
+++ b/LayoutTests/fast/events/touch/gesture/gesture-scroll-zoomed.html
@@ -69,8 +69,8 @@ td {
 var movingdiv;
 var expectedScrollsTotal = 2;
 var scrollsOccurred = 0;
-var scrollAmountX = ['90', '90'];
-var scrollAmountY = ['0', '95'];
+var scrollAmountX = ['80', '80'];
+var scrollAmountY = ['0', '32'];
 
 function checkScrollOffset()
 {
@@ -95,8 +95,9 @@ function firstGestureScrollSequence()
 {
     debug("first gesture");
 
-    eventSender.gestureScrollBegin(95, 12);
-    eventSender.gestureScrollUpdate(-90, 0);
+    window.internals.setZoomFactor(0.5);
+    eventSender.gestureScrollBegin(45, 12);
+    eventSender.gestureScrollUpdate(-40, 0);
     eventSender.gestureScrollEnd(0, 0);
 
     // Wait for layout.
@@ -107,8 +108,9 @@ function secondGestureScrollSequence()
 {
     debug("second gesture");
 
-    eventSender.gestureScrollBegin(12, 97);
-    eventSender.gestureScrollUpdate(0, -95);
+    window.internals.setZoomFactor(1.25);
+    eventSender.gestureScrollBegin(12, 47);
+    eventSender.gestureScrollUpdate(0, -40);
     eventSender.gestureScrollEnd(0, 0);
 
     // Wait for layout.
@@ -131,7 +133,7 @@ function runTest()
     var movingdiv = document.getElementById('movingbox');
 
     if (window.eventSender) {
-        description('This tests scroll gesture events. ' +
+        description('This tests scroll gesture events with browser zoom. ' +
             'Square is (mostly) green on pass');
 
         if (eventSender.clearTouchPoints)