Use document-wide passive touch listener to update ghostclick blocker…

… target

Fixes #4128

src/standard/gestures.html

@@ -38,6 +38,17 @@
     }
   })();
 
+  // check for passive event listeners
+  var SUPPORTS_PASSIVE = (function() {
+    var sp = false;
+    try {
+      var opts = Object.defineProperty({}, 'passive', {get: function() {sp = true;}})
+      window.addEventListener('test', null, opts);
+      window.removeEventListener('test', null, opts);
+      return sp;
+    } catch(e) {}
+  })();
+
   // Check for touch-only devices
   var IS_TOUCH_ONLY = navigator.userAgent.match(/iP(?:[oa]d|hone)|Android/);
 
@@ -82,7 +93,7 @@
     }
   }
 
-  function ignoreMouse() {
+  function ignoreMouse(ev) {
     if (!POINTERSTATE.mouse.mouseIgnoreJob) {
       setupTeardownMouseCanceller(true);
     }
@@ -91,6 +102,7 @@
       POINTERSTATE.mouse.target = null;
       POINTERSTATE.mouse.mouseIgnoreJob = null;
     };
+    POINTERSTATE.mouse.target = Polymer.dom(ev).rootTarget;
     POINTERSTATE.mouse.mouseIgnoreJob =
       Polymer.Debounce(POINTERSTATE.mouse.mouseIgnoreJob, unset, MOUSE_TIMEOUT);
   }
@@ -178,6 +190,10 @@
     stateObj.upfn = null;
   }
 
+  if (HAS_NATIVE_TA) {
+    document.addEventListener('touchend', ignoreMouse, SUPPORTS_PASSIVE ? {passive: true} : false);
+  }
+
   var Gestures = {
     gestures: {},
     recognizers: [],
@@ -234,14 +250,11 @@
           if (!HAS_NATIVE_TA) {
             if (type === 'touchstart' || type === 'touchmove') {
               Gestures.handleTouchAction(ev);
+            } else if (type === 'touchend') {
+              // ignore syntethic mouse events after a touch
+              ignoreMouse(ev);
             }
           }
-          // disable synth mouse events, unless this event is itself simulated
-          if (type === 'touchend') {
-            POINTERSTATE.mouse.target = Polymer.dom(ev).rootTarget;
-            // ignore syntethic mouse events after a touch
-            ignoreMouse();
-          }
         }
       }
       handled = ev[HANDLED_OBJ];