Context menu egtests, plus related utilities.

ios/web/shell/test/earl_grey/shell_matchers.mm

Index: ios/web/shell/test/earl_grey/shell_matchers.mm
diff --git a/ios/web/shell/test/earl_grey/shell_matchers.mm b/ios/web/shell/test/earl_grey/shell_matchers.mm
index 88e6e1222014c38f82c679367efa5746970ca771..8e7dea994bcb47aaf7aec58bd7ffd7b0f1478bf2 100644
--- a/ios/web/shell/test/earl_grey/shell_matchers.mm
+++ b/ios/web/shell/test/earl_grey/shell_matchers.mm
@@ -24,6 +24,10 @@ id<GREYMatcher> webViewCssSelector(std::string selector) {
   return webViewCssSelector(std::move(selector), web_state);
 }
 
+id<GREYMatcher> webView() {
+  return webViewInWebState(shell_test_util::GetCurrentWebState());
+}
+
 id<GREYMatcher> webViewScrollView() {
   return webViewScrollView(shell_test_util::GetCurrentWebState());
 }