Create ChromeEarlGrey waitForWebViewContainingText.

ios/chrome/browser/web/browsing_prevent_default_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 "components/content_settings/core/browser/host_content_settings_map.h"
@@ skipping 75 matching lines @@
   ScopedBlockPopupsPref scoper(CONTENT_SETTING_ALLOW);
   web::test::SetUpFileBasedHttpServer();
 
   const GURL testURL = GetTestUrl();
   [ChromeEarlGrey loadURL:testURL];
   chrome_test_util::AssertMainTabCount(1U);
 
   // Tap on the test link and wait for the page to display "Click done", as an
   // indicator that the element was tapped.
   chrome_test_util::TapWebViewElementWithId(linkID);
-  [[GREYCondition
-      conditionWithName:@"Waiting for webview to display 'Click done'."
-                  block:^BOOL {
-                    id<GREYMatcher> webViewMatcher =
-                        chrome_test_util::WebViewContainingText("Click done");
-                    NSError* error = nil;
-                    [[EarlGrey selectElementWithMatcher:webViewMatcher]
-                        assertWithMatcher:grey_notNil()
-                                    error:&error];
-                    return error == nil;
-                  }] waitWithTimeout:kConditionTimeout];
+  [ChromeEarlGrey waitForWebViewContainingText:@"Click done"];
 
   // Check that no navigation occurred and no new tabs were opened.
   chrome_test_util::AssertMainTabCount(1U);
   const GURL& currentURL =
       chrome_test_util::GetCurrentWebState()->GetVisibleURL();
   GREYAssert(currentURL == testURL, @"Page navigated unexpectedly %s",
              currentURL.spec().c_str());
 }
 
 // Taps a link with onclick="event.preventDefault()" and target="_blank" and
@@ skipping 21 matching lines @@
   web::test::SetUpFileBasedHttpServer();
 
   const GURL testURL = GetTestUrl();
   [ChromeEarlGrey loadURL:testURL];
   chrome_test_util::AssertMainTabCount(1U);
 
   // Tap on the test link.
   const std::string linkID =
       "webScenarioBrowsingLinkPreventDefaultOverridesWindowOpen";
   chrome_test_util::TapWebViewElementWithId(linkID);
-
-  // Stall a bit to make sure the webview doesn't do anything asynchronously.
-  [[GREYCondition
-      conditionWithName:@"Waiting for webview to display 'Click done'."
-                  block:^BOOL {
-                    id<GREYMatcher> webViewMatcher =
-                        chrome_test_util::WebViewContainingText("Click done");
-                    NSError* error = nil;
-                    [[EarlGrey selectElementWithMatcher:webViewMatcher]
-                        assertWithMatcher:grey_notNil()
-                                    error:&error];
-                    return error == nil;
-                  }] waitWithTimeout:kConditionTimeout];
+  [ChromeEarlGrey waitForWebViewContainingText:@"Click done"];
 
   // Check that the tab navigated to about:blank and no new tabs were opened.
   [[GREYCondition
       conditionWithName:@"Wait for navigation to about:blank"
                   block:^BOOL {
                     const GURL& currentURL =
                         chrome_test_util::GetCurrentWebState()->GetVisibleURL();
                     return currentURL == GURL(url::kAboutBlankURL);
                   }] waitWithTimeout:kConditionTimeout];
   chrome_test_util::AssertMainTabCount(1U);
 }
 
 @end