fix long-stack-trace zone will not render correctly when reject a promise (#403)

Author: JiaLiPassion

dist/long-stack-trace-zone.js

@@ -118,7 +118,7 @@
 	            return parentZoneDelegate.scheduleTask(targetZone, task);
 	        },
 	        onHandleError: function (parentZoneDelegate, currentZone, targetZone, error) {
-	            var parentTask = Zone.currentTask;
+	            var parentTask = Zone.currentTask || error.task;
 	            if (error instanceof Error && parentTask) {
 	                var descriptor = Object.getOwnPropertyDescriptor(error, 'stack');
 	                if (descriptor) {

dist/long-stack-trace-zone.min.js

@@ -85,7 +85,7 @@
     onHandleError: function(parentZoneDelegate: ZoneDelegate, currentZone: Zone, targetZone: Zone,
                  error: any): any
     {
-      const parentTask = Zone.currentTask;
+      const parentTask = Zone.currentTask || error.task;
       if (error instanceof Error && parentTask) {
         let descriptor = Object.getOwnPropertyDescriptor(error, 'stack');
         if (descriptor) {

lib/zone-spec/long-stack-trace.ts

@@ -32,6 +32,31 @@ describe('longStackTraceZone', function () {
       }, 0);
     });
   });
+
+  it('should produce long stack traces when reject in promise', function(done) {
+    lstz.runGuarded(function () {
+      setTimeout(function () {
+        setTimeout(function () {
+          let promise = new Promise(function (resolve, reject) {
+             setTimeout(function (){
+               reject(new Error('Hello Promise'));
+             }, 0);
+          });
+          promise.then(function() {
+            fail('should not get here');
+          });
+          setTimeout(function () {
+            try {
+              expect(log[0].split('Elapsed: ').length).toBe(5);
+              done();
+            } catch (e) {
+              expect(e).toBe(null);
+            }
+          }, 0);
+        }, 0);
+      }, 0);
+    });
+  });
 });
 
 export var __something__;