Add unittest to test CWVWebView.

ios/web_view/test/chrome_web_view_test.mm

+// 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.
+
+#import "ios/web_view/test/chrome_web_view_test.h"
+
+#import <ChromeWebView/ChromeWebView.h>
+#import <Foundation/Foundation.h>
+
+#import "ios/testing/wait_util.h"
+#include "ios/web_view/test/test_server.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+ChromeWebViewTest::ChromeWebViewTest() {}
+
+ChromeWebViewTest::~ChromeWebViewTest() = default;
+
+void ChromeWebViewTest::SetUp() {
+  PlatformTest::SetUp();
+  ios_web_view::TestServer::Start();

[Eugene But (OOO till 7-30), 2017/05/19 18:39:49]

Can we be more consistent with ios_web_inttets and EG tests here?

[michaeldo, 2017/05/23 16:20:52]

Unfortunately, I don't think so. See my comment in the test file about why I
can't include the public web test helpers.

We need to figure out if we can completely hide symbols within the
ChromeWebView.framework first.

+}
+
+void ChromeWebViewTest::TearDown() {
+  ios_web_view::TestServer::Shutdown();
+  PlatformTest::TearDown();
+}
+
+void ChromeWebViewTest::LoadURL(CWVWebView* web_view, NSURL* URL) {
+  [web_view loadRequest:[NSURLRequest requestWithURL:URL]];
+
+  WaitForPageLoadCompletion(web_view);
+}
+
+void ChromeWebViewTest::WaitForPageLoadCompletion(CWVWebView* web_view) {
+  BOOL success =
+      testing::WaitUntilConditionOrTimeout(testing::kWaitForPageLoadTimeout, ^{
+        return !web_view.isLoading;
+      });
+  EXPECT_TRUE(success);

[Eugene But (OOO till 7-30), 2017/05/19 18:39:49]

Should this be ASSERT_TRUE? There is no point in running the test if page did
not load. Right?

[michaeldo, 2017/05/23 16:20:52]

You're right, changed to ASSERT_TRUE.

+}