Implement Middle Click Autoscroll on all platforms not just Windows

third_party/WebKit/LayoutTests/fast/events/resources/panScroll.js

Index: third_party/WebKit/LayoutTests/fast/events/resources/panScroll.js
diff --git a/third_party/WebKit/LayoutTests/fast/events/resources/panScroll.js b/third_party/WebKit/LayoutTests/fast/events/resources/panScroll.js
deleted file mode 100644
index bb125def7abc655bdb707563965a100acb27cdf1..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/fast/events/resources/panScroll.js
+++ /dev/null
@@ -1,82 +0,0 @@
-var autoscrollInterval = 50;
-var middleButton = 1;
-var panScrollRadius = 15; // from FrameView::noPanScrollRadius
-
-window.jsTestIsAsync = true;
-
-function $(id)
-{
-    return document.getElementById(id);
-}
-
-function testPanScroll(param)
-{
-    function finishTest()
-    {
-        if ($('container'))
-            $('container').innerHTML = '';
-        if (param.finishTest)
-            param.finishTest();
-        if (window.finishJSTest) {
-            finishJSTest();
-            return;
-        }
-        if (window.testRunner)
-            testRunner.notifyDone();
-    }
-
-    var scrollable = param.scrollable;
-    var scrolledObject = param.scrolledObject || scrollable;
-
-    if (!scrollable.innerHTML) {
-        for (var i = 0; i < 100; ++i) {
-            var line = document.createElement('div');
-            line.innerHTML = "line " + i;
-            scrollable.appendChild(line);
-        }
-    }
-
-    var noModeScroll = false;
-    var scrolled = false;
-
-    scrolledObject.onscroll = function() {
-        if (noModeScroll) {
-            testFailed('still autoscroll');
-            finishTest();
-            return;
-        }
-
-        if (scrolled)
-            return;
-        scrolled = true;
-        testPassed('autoscroll started');
-
-        if (window.eventSender) {
-            if (param.clickOrDrag == 'click')
-                eventSender.mouseDown(middleButton);
-            eventSender.mouseUp(middleButton);
-        }
-    };
-
-    scrollable.ownerDocument.onmouseup = function(e) {
-        if (!scrolled || e.button != middleButton)
-            return;
-        noMoreScroll = true;
-        window.setTimeout(function() {
-            testPassed('autoscroll stopped');
-            finishTest();
-        }, autoscrollInterval * 2);
-    };
-
-    if (!window.eventSender)
-        return;
-    var startX = param.startX || scrollable.offsetLeft + 5;
-    var startY = param.startY || scrollable.offsetTop + 5;
-    var endX = param.endX || scrollable.offsetLeft + 5;
-    var endY = param.endY || scrollable.offsetTop + panScrollRadius + 6;
-    eventSender.mouseMoveTo(startX, startY);
-    eventSender.mouseDown(middleButton);
-    if (param.clickOrDrag == 'click')
-        eventSender.mouseUp(middleButton);
-    eventSender.mouseMoveTo(endX, endY);
-}