Context menu egtests, plus related utilities.

ios/testing/earl_grey/matchers.h

Index: ios/testing/earl_grey/matchers.h
diff --git a/ios/testing/earl_grey/matchers.h b/ios/testing/earl_grey/matchers.h
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+// 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.
+
+#ifndef IOS_TESTING_EARL_GREY_MATCHERS_H_
+#define IOS_TESTING_EARL_GREY_MATCHERS_H_
+
+#import <Foundation/Foundation.h>
+
+#import <EarlGrey/EarlGrey.h>
+
+namespace testing {
+
+// Matcher for context menu item whose text is exactly |text|.
+id<GREYMatcher> contextMenuItemWithText(NSString* text);
+
+// Matcher for a UI element to tap to dismiss the the context menu, where
+// |cancel_text| is the localized text used for the action sheet cancel control.
+// On phones, where the context menu is an action sheet, this will be a matcher
+// for the menu item with |cancel_text| as its label.
+// On tablets, where the context menu is a popover, this will be a matcher for
+// some element outside of the popover.
+id<GREYMatcher> elementToDismissContextMenu(NSString* cancel_text);
+
+}  // namespace testing
+
+#endif  // IOS_TESTING_EARL_GREY_MATCHERS_H_