Adds mailto: URL support to app launching.

ios/chrome/browser/web/mailto_handler_unittest.mm

Index: ios/chrome/browser/web/mailto_handler_unittest.mm
diff --git a/ios/chrome/browser/web/mailto_handler_unittest.mm b/ios/chrome/browser/web/mailto_handler_unittest.mm
new file mode 100644
index 0000000000000000000000000000000000000000..189c794f6f480ac36596ae07aed277c7cf04e923
--- /dev/null
+++ b/ios/chrome/browser/web/mailto_handler_unittest.mm
@@ -0,0 +1,15 @@
+// Copyright 2017 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.
+
+#include "ios/chrome/browser/web/mailto_handler.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/gtest_mac.h"
+
+TEST(MailtoHandlerTest, TestConstructor) {
+  MailtoHandler* handler =
+      [[MailtoHandler alloc] initWithName:@"Some App" appStoreID:@"12345"];
+  EXPECT_NSEQ(@"Some App", [handler appName]);
+  EXPECT_NSEQ(@"12345", [handler appStoreID]);
+}