Use shared matchers for common elements.

ios/chrome/test/earl_grey/chrome_matchers.h

Index: ios/chrome/test/earl_grey/chrome_matchers.h
diff --git a/ios/chrome/test/earl_grey/chrome_matchers.h b/ios/chrome/test/earl_grey/chrome_matchers.h
index 3b4d5873247d3b240e055e4f51ed5f0e79ce8fed..f6ac5f0b5cb1f3df68278bc83a7c46e8fd3d36b6 100644
--- a/ios/chrome/test/earl_grey/chrome_matchers.h
+++ b/ios/chrome/test/earl_grey/chrome_matchers.h
@@ -84,6 +84,10 @@ id<GREYMatcher> ShowTabsButton();
 id<GREYMatcher> CollectionViewSwitchCell(NSString* accessibilityIdentifier,
                                          BOOL isOn);
 
+// Matcher for the Open in New Tab option in the context menu when long pressing
+// a link.
+id<GREYMatcher> OpenLinkInNewTabMenuItem();
+
 }  // namespace chrome_test_util
 
 #endif  // IOS_CHROME_TEST_EARL_GREY_CHROME_MATCHERS_H_