Create ChromeEarlGrey waitForWebViewContainingText.

ios/chrome/browser/context_menu/context_menu_egtest.mm

 // 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 <EarlGrey/EarlGrey.h>
 #import <UIKit/UIKit.h>
 #import <XCTest/XCTest.h>
 
 #include "base/strings/sys_string_conversions.h"
 #include "ios/chrome/browser/ui/ui_util.h"
@@ skipping 206 matching lines @@
   // TODO(crbug.com/702272): Try to replace this with one EarlGrey method call.
   [[EarlGrey
       selectElementWithMatcher:WebViewScrollView(
                                    chrome_test_util::GetCurrentWebState())]
       performAction:grey_swipeFastInDirection(kGREYDirectionUp)];
   [[EarlGrey
       selectElementWithMatcher:WebViewScrollView(
                                    chrome_test_util::GetCurrentWebState())]
       performAction:grey_scrollToContentEdge(kGREYContentEdgeBottom)];
 
-  [[EarlGrey selectElementWithMatcher:chrome_test_util::WebViewContainingText(
-                                          kDestinationLinkID)]
-      assertWithMatcher:grey_notNil()];
+  [ChromeEarlGrey
+      waitForWebViewContainingText:base::SysUTF8ToNSString(kDestinationLinkID)];
 
   LongPressElementAndTapOnButton(kDestinationLinkID, OpenLinkInNewTabButton());
 
   // Earl Grey cannot preperly synchronize some animations, so adding a
   // WaitUntilCondition to wait for the new tab opening animation to finish
   // and the scroll view to become interactable.
   ConditionBlock condition = ^{
     NSError* error = nil;
     [[EarlGrey
         selectElementWithMatcher:WebViewScrollView(
@@ skipping 17 matching lines @@
   SelectTabAtIndexInCurrentMode(1U);
 
   // Verify url and tab count.
   [[EarlGrey selectElementWithMatcher:chrome_test_util::OmniboxText(
                                           destinationURL.GetContent())]
       assertWithMatcher:grey_notNil()];
   chrome_test_util::AssertMainTabCount(2U);
 }
 
 @end