Fixes #1041, Android WebView triggers two clicks at once. This calls

L.DomEvent.stop(event) on the second if two clicks are triggered within 400ms
of each other. Double click is unaffected however.

There are other workarounds that focus on _fireMouseEvent(), however I had to
resolve it at the click event level as my map, markers, controls, were all
affected.

src/dom/DomEvent.js

@@ -41,6 +41,13 @@ L.DomEvent = {
 
 				obj.addEventListener(newType, handler, false);
 
+			} else if (type === 'click') {
+				originalHandler = handler;
+				handler = function(e) {
+					return L.DomEvent._filterClick(e, originalHandler);
+				};
+
+				obj.addEventListener(type, handler, false);
 			} else {
 				obj.addEventListener(type, handler, false);
 			}
@@ -179,6 +186,21 @@ L.DomEvent = {
 			}
 		}
 		return e;
+	},
+	/*jshint noarg:false */
+
+	// this solves a bug in Android WebView where 
+	// a single touch triggers two click events.
+	_filterClick: function(e, handler) {
+		// are they closer together than 400ms?
+		// Android typically triggers them ~300ms apart
+		if ((e.timeStamp - L.DomEvent._lastClick) < 400) {
+			L.DomEvent.stop(e);
+			return;
+		}
+		L.DomEvent._lastClick = e.timeStamp;
+
+		return handler(e);
 	}
 };