Create ChromeEarlGrey waitForWebViewContainingText.

ios/chrome/browser/ui/print/print_controller_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>
 
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/chrome/test/app/navigation_test_util.h"
+#import "ios/chrome/test/earl_grey/chrome_earl_grey.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey_ui.h"
 #import "ios/chrome/test/earl_grey/chrome_matchers.h"
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
 #import "ios/web/public/test/http_server/http_server.h"
 #include "ios/web/public/test/http_server/http_server_util.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "url/gurl.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
@@ skipping 22 matching lines @@
 // Tests that the AirPrint menu successfully loads when a normal web page is
 // loaded.
 - (void)testPrintNormalPage {
   GURL url = web::test::HttpServer::MakeUrl(kHTMLURL);
   std::map<GURL, std::string> responses;
   std::string response = "Test";
   responses[url] = response;
   web::test::SetUpSimpleHttpServer(responses);
 
   chrome_test_util::LoadUrl(url);
-  id<GREYMatcher> response1Matcher =
-      chrome_test_util::WebViewContainingText(response);
-  [[EarlGrey selectElementWithMatcher:response1Matcher]
-      assertWithMatcher:grey_notNil()];
+  [ChromeEarlGrey waitForWebViewContainingText:response];
 
   [self printCurrentPage];
 }
 
 // Tests that the AirPrint menu successfully loads when a PDF is loaded.
 - (void)testPrintPDF {
   web::test::SetUpFileBasedHttpServer();
   GURL url = web::test::HttpServer::MakeUrl(kPDFURL);
   chrome_test_util::LoadUrl(url);
 
   [self printCurrentPage];
 }
 
 - (void)printCurrentPage {
   [ChromeEarlGreyUI openShareMenu];
 
   id<GREYMatcher> printButton =
       grey_allOf(grey_accessibilityLabel(@"Print"),
                  grey_accessibilityTrait(UIAccessibilityTraitButton), nil);
   [[EarlGrey selectElementWithMatcher:printButton] performAction:grey_tap()];
 
   id<GREYMatcher> printerOptionButton = grey_allOf(
       grey_accessibilityLabel(@"Printer Options"),
       grey_not(grey_accessibilityTrait(UIAccessibilityTraitHeader)), nil);
   [[EarlGrey selectElementWithMatcher:printerOptionButton]
       assertWithMatcher:grey_sufficientlyVisible()];
 }
 
 @end