Add tests for the XPC client.

chrome/browser/notifications/stub_alert_dispatcher_mac.mm

Index: chrome/browser/notifications/stub_alert_dispatcher_mac.mm
diff --git a/chrome/browser/notifications/stub_alert_dispatcher_mac.mm b/chrome/browser/notifications/stub_alert_dispatcher_mac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..2c193f78eaaf0d206a52922bb41825e410d4eb97
--- /dev/null
+++ b/chrome/browser/notifications/stub_alert_dispatcher_mac.mm
@@ -0,0 +1,50 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "chrome/browser/notifications/stub_alert_dispatcher_mac.h"
+
+#include "base/mac/scoped_nsobject.h"
+#include "chrome/browser/ui/cocoa/notifications/notification_constants_mac.h"
+
+@implementation StubAlertDispatcher {
+  base::scoped_nsobject<NSMutableArray> alerts_;
+}
+
+- (instancetype)init {
+  if ((self = [super init])) {
+    alerts_.reset([[NSMutableArray alloc] init]);
+  }
+  return self;
+}
+
+- (void)dispatchNotification:(NSDictionary*)data {
+  [alerts_ addObject:data];
+}
+
+- (void)closeNotificationWithId:(NSString*)notificationId
+                  withProfileId:(NSString*)profileId {
+  DCHECK(profileId);
+  DCHECK(notificationId);
+  for (NSDictionary* toast in alerts_.get()) {
+    NSString* toastId =
+        [toast objectForKey:notification_constants::kNotificationId];
+    NSString* persistentProfileId =
+        [toast objectForKey:notification_constants::kNotificationProfileId];
+    if ([toastId isEqualToString:notificationId] &&
+        [persistentProfileId isEqualToString:profileId]) {
+      [alerts_ removeObject:toast];
+      break;
+    }
+  }
+}
+
+- (void)closeAllNotifications {
+  [alerts_ removeAllObjects];
+}
+
+- (NSArray*)alerts {
+  return [[alerts_ copy] autorelease];
+}
+
+@end