Upstream Chrome on iOS source code [10/11].

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.
+
+#import "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"
+
+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