Move EarlGrey helper to check toolbar visibility into ChromeEarlGreyUI.

ios/chrome/test/earl_grey/chrome_util.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.
-
-#include "ios/chrome/test/earl_grey/chrome_util.h"
-
-#import <EarlGrey/EarlGrey.h>
-
-#import "ios/chrome/browser/ui/toolbar/toolbar_controller.h"
-#import "ios/chrome/test/app/chrome_test_util.h"
-#import "ios/testing/wait_util.h"
-#import "ios/web/public/test/earl_grey/web_view_matchers.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-namespace {
-const NSTimeInterval kWaitForToolbarAnimationTimeout = 1.0;
-}  // namespace
-
-namespace chrome_test_util {
-
-void AssertToolbarNotVisible() {
-  ConditionBlock condition = ^{
-    id<GREYMatcher> toolsMenuButton =
-        grey_allOf(grey_accessibilityID(kToolbarToolsMenuButtonIdentifier),
-                   grey_sufficientlyVisible(), nil);
-    NSError* error = nil;
-    [[EarlGrey selectElementWithMatcher:toolsMenuButton]
-        assertWithMatcher:grey_notNil()
-                    error:&error];
-    return error != nil;
-  };
-  GREYAssert(testing::WaitUntilConditionOrTimeout(
-                 kWaitForToolbarAnimationTimeout, condition),
-             @"The toolbar is still visible.");
-}
-
-void AssertToolbarVisible() {
-  ConditionBlock condition = ^{
-    id<GREYMatcher> toolsMenuButton =
-        grey_allOf(grey_accessibilityID(kToolbarToolsMenuButtonIdentifier),
-                   grey_sufficientlyVisible(), nil);
-    NSError* error = nil;
-    [[EarlGrey selectElementWithMatcher:toolsMenuButton]
-        assertWithMatcher:grey_notNil()
-                    error:&error];
-    return error == nil;
-  };
-  GREYAssert(testing::WaitUntilConditionOrTimeout(
-                 kWaitForToolbarAnimationTimeout, condition),
-             @"The toolbar is not visible.");
-}
-
-}  // namespace chrome_test_util