Consolidated all CWVWebView test helpers inside web_view_test_util file.

ios/web_view/test/web_view_test_util.h

 // 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.
 
 #ifndef IOS_WEB_VIEW_TEST_WEB_VIEW_TEST_UTIL_H_
 #define IOS_WEB_VIEW_TEST_WEB_VIEW_TEST_UTIL_H_
 
 #import <Foundation/Foundation.h>
 
+#include "base/compiler_specific.h"
+
 @class CWVWebView;
 
 namespace ios_web_view {
 namespace test {
 
 // Creates web view with default configuration and frame equal to screen bounds.
-CWVWebView* CreateWebView();
+CWVWebView* CreateWebView() WARN_UNUSED_RESULT;
+
+// Loads |URL| in |web_view| and waits until the load completes. Asserts if
+// loading does not complete.
+bool LoadUrl(CWVWebView* web_view, NSURL* url) WARN_UNUSED_RESULT;
 
 // Returns whether the element with |element_id| in the passed |web_view| has
 // been tapped using a JavaScript click() event.
-bool TapChromeWebViewElementWithId(CWVWebView* web_view, NSString* element_id);
+bool TapWebViewElementWithId(CWVWebView* web_view,
+                             NSString* element_id) WARN_UNUSED_RESULT;
 
 // Waits until |script| is executed and synchronously returns the evaluation
 // result.
 id EvaluateJavaScript(CWVWebView* web_view, NSString* script, NSError** error);
 
 // Waits for |web_view| to contain |text|. Returns false if the condition is not
 // met within a timeout.
 bool WaitForWebViewContainingTextOrTimeout(CWVWebView* web_view,
-                                           NSString* text);
+                                           NSString* text) WARN_UNUSED_RESULT;
+
+// Waits until |web_view| stops loading. Returns false if the condition is not
+// met within a timeout.
+bool WaitForWebViewLoadCompletionOrTimeout(CWVWebView* web_view)
+    WARN_UNUSED_RESULT;
 
 }  // namespace test
 }  // namespace ios_web_view
 
 #endif  // IOS_WEB_VIEW_TEST_WEB_VIEW_TEST_UTIL_H_