Create ChromeEarlGrey waitForWebViewContainingText.

ios/chrome/browser/translate/translate_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 <XCTest/XCTest.h>
 
 #include "base/command_line.h"
 #include "base/mac/bind_objc_block.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 743 matching lines @@
 
   // Wait for all callbacks.
   GREYAssert(testing::WaitUntilConditionOrTimeout(
                  testing::kWaitForJSCompletionTimeout,
                  ^{
                    return jsTranslateManager.get().translateStatusChecked;
                  }),
              @"Did not receive all translate status callbacks");
 
   // Check that the translation happened.
-  [[EarlGrey selectElementWithMatcher:chrome_test_util::WebViewContainingText(
-                                          "Translated")]
-      assertWithMatcher:grey_notNil()];
+  [ChromeEarlGrey waitForWebViewContainingText:@"Translated"];
 
   // Click on the link.
   [ChromeEarlGrey tapWebViewElementWithID:@"link"];
   GURL frenchPagePathURL = web::test::HttpServer::MakeUrl(
       base::StringPrintf("http://%s", kFrenchPagePath));
-  [[EarlGrey
-      selectElementWithMatcher:chrome_test_util::WebViewContainingText("link")]
-      assertWithMatcher:grey_nil()];
+  [ChromeEarlGrey waitForWebViewContainingText:@"link"];
   [[EarlGrey selectElementWithMatcher:chrome_test_util::OmniboxText(
                                           frenchPagePathURL.GetContent())]
       assertWithMatcher:grey_notNil()];
 
   // Check that the auto-translation happened.
-  [[EarlGrey selectElementWithMatcher:chrome_test_util::WebViewContainingText(
-                                          "Translated")]
-      assertWithMatcher:grey_notNil()];
+  [ChromeEarlGrey waitForWebViewContainingText:@"Translated"];
 }
 
 #pragma mark - Utility methods
 
 // Waits until a language has been detected and checks the language details.
 - (void)assertLanguageDetails:
     (const LanguageDetectionController::DetectionDetails&)expectedDetails {
   GREYAssert(testing::WaitUntilConditionOrTimeout(
                  2.0,
                  ^{
@@ skipping 43 matching lines @@
   [[EarlGrey
       selectElementWithMatcher:chrome_test_util::ButtonWithAccessibilityLabelId(
                                    IDS_TRANSLATE_INFOBAR_REVERT)]
       assertWithMatcher:grey_notNil()];
   [[EarlGrey
       selectElementWithMatcher:chrome_test_util::ButtonWithAccessibilityLabelId(
                                    IDS_CLOSE)] assertWithMatcher:grey_notNil()];
 }
 
 @end