Bug 1288187 - Enable touch tests on OS X. r=botond

Also remove a bunch of superfluous window.TouchEvent checks, because the test
harness forces the touch events enabled so the checks are never false.

MozReview-Commit-ID: FQcQiuo1sQ9

gfx/layers/apz/test/mochitest/helper_long_tap.html

@@ -10,12 +10,6 @@
   <script type="application/javascript">
 
 function longPressLink() {
-  if (!window.TouchEvent) {
-    ok(true, "Touch events are not supported on this platform, sorry!\n");
-    subtestDone();
-    return;
-  }
-
   synthesizeNativeTouch(document.getElementById('b'), 5, 5, SpecialPowers.DOMWindowUtils.TOUCH_CONTACT, function() {
     dump("Finished synthesizing touch-start, waiting for events...\n");
   });

gfx/layers/apz/test/mochitest/helper_scrollto_tap.html

@@ -38,12 +38,6 @@ function startTest() {
 }
 
 function clickButton() {
-  if (!window.TouchEvent) {
-    ok(true, "Touch events are not supported on this platform, sorry!\n");
-    subtestDone();
-    return;
-  }
-
   document.addEventListener('click', clicked, false);
 
   synthesizeNativeTap(document.getElementById('b'), 5, 5, function() {

gfx/layers/apz/test/mochitest/helper_tap.html

@@ -10,12 +10,6 @@
   <script type="application/javascript">
 
 function clickButton() {
-  if (!window.TouchEvent) {
-    ok(true, "Touch events are not supported on this platform, sorry!\n");
-    subtestDone();
-    return;
-  }
-
   document.addEventListener('click', clicked, false);
 
   synthesizeNativeTap(document.getElementById('b'), 5, 5, function() {

gfx/layers/apz/test/mochitest/helper_tap_passive.html

@@ -12,12 +12,6 @@
 var touchdownTime;
 
 function longPressLink() {
-  if (!window.TouchEvent) {
-    ok(true, "Touch events are not supported on this platform, sorry!\n");
-    subtestDone();
-    return;
-  }
-
   synthesizeNativeTouch(document.getElementById('b'), 5, 5, SpecialPowers.DOMWindowUtils.TOUCH_CONTACT, function() {
     dump("Finished synthesizing touch-start, waiting for events...\n");
   });

gfx/layers/apz/test/mochitest/mochitest.ini

@@ -48,8 +48,7 @@ skip-if = (os == 'android') || (os == 'b2g') || (buildapp == 'mulet') # wheel ev
 [test_frame_reconstruction.html]
 [test_group_touchevents.html]
 # Windows touch injection doesn't work in automation, but this test can be run locally on a windows touch device.
-# On OS X we don't support touch events at all.
-skip-if = (toolkit == 'windows') || (toolkit == 'cocoa')
+skip-if = (toolkit == 'windows')
 [test_group_wheelevents.html]
 skip-if = (toolkit == 'android') # wheel events not supported on mobile
 [test_group_mouseevents.html]

gfx/layers/apz/test/mochitest/test_group_touchevents.html

@@ -70,6 +70,7 @@ var subtests = [
 ];
 
 if (isApzEnabled()) {
+  ok(window.TouchEvent, "Check if TouchEvent is supported (it should be, the test harness forces it on everywhere)");
   if (getPlatform() == "android") {
     // This has a lot of subtests, and Android emulators are slow.
     SimpleTest.requestLongerTimeout(2);