Make ninja work with XCTests for iOS.

test/ios/xctests/AppTests/AppTests.m

Index: test/ios/xctests/AppTests/AppTests.m
diff --git a/test/ios/xctests/AppTests/AppTests.m b/test/ios/xctests/AppTests/AppTests.m
new file mode 100644
index 0000000000000000000000000000000000000000..22121b089d56724173b6a4cd4384c964b845af9c
--- /dev/null
+++ b/test/ios/xctests/AppTests/AppTests.m
@@ -0,0 +1,31 @@
+// Copyright 2015 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 <UIKit/UIKit.h>
+#import <XCTest/XCTest.h>
+
+@interface AppTests : XCTestCase
+
+@end
+
+@implementation AppTests
+
+- (void)setUp {
+    [super setUp];
+}
+
+- (void)tearDown {
+    [super tearDown];
+}
+
+- (void)testExample {
+    XCTAssert(YES, @"Pass");
+}
+
+- (void)testPerformanceExample {
+    [self measureBlock:^{
+    }];
+}
+
+@end