fix(input): setViewValue on compositionend

Because of a4e6d96, model is not updated on input/change between the
compositionstart and compositionend events. Unfortunately, the compositionend
event does not always happen prior to an input/change event.

This changeset calls the listener function to update the model after a
compositionend event is received.

Closes angular#6058
Closes angular#5433

src/ng/directive/input.js

@@ -447,6 +447,7 @@ function textInputType(scope, element, attr, ctrl, $sniffer, $browser) {
 
     element.on('compositionend', function() {
       composing = false;
+      listener();
     });
   }
 

test/ng/directive/inputSpec.js

@@ -509,6 +509,17 @@ describe('input', function() {
     });
   }
 
+  it('should update the model on "compositionend"', function() {
+    compileInput('<input type="text" ng-model="name" name="alias" />');
+    if (!(msie < 9)) {
+      browserTrigger(inputElm, 'compositionstart');
+      changeInputValueTo('caitp');
+      expect(scope.name).toBeUndefined();
+      browserTrigger(inputElm, 'compositionend');
+      expect(scope.name).toEqual('caitp');
+    }
+  });
+
   describe('"change" event', function() {
     function assertBrowserSupportsChangeEvent(inputEventSupported) {
       // Force browser to report a lack of an 'input' event