[ios] EarlGrey test for PDF Mime type.

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

 // 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 <string>
 
 #import <EarlGrey/EarlGrey.h>
 
 namespace web {
 
 // Shorthand for GREYMatchers::matcherForWebViewContainingText.
 id<GREYMatcher> webViewContainingText(const std::string& text);
 
 // Shorthand for GREYMatchers::matcherForWebWithCSSSelector.
 id<GREYMatcher> webViewCssSelector(const std::string& selector);
 
 // Shorthand for GREYMatchers::matcherForWebViewScrollView.
 id<GREYMatcher> webViewScrollView();
 
+// Shorthand for GREYMatchers::matcherForWebViewMIMETYPE.
+id<GREYMatcher> webViewMimeType(const std::string& mime_type);
+
 // Shorthand for GREYMatchers::matcherForAddressFieldEqualToText.
 id<GREYMatcher> addressFieldText(const std::string& text);
 
 // Shorthand for GREYMatchers::matcherForBackButton.
 id<GREYMatcher> backButton();
 
 // Shorthand for GREYMatchers::matcherForForwardButton.
 id<GREYMatcher> forwardButton();
 
 // Shorthand for GREYMatchers::matcherForAddressField.
 id<GREYMatcher> addressField();
 
 }  // namespace web
 
 @interface GREYMatchers (WebShellAdditions)
 
 // Matcher for WKWebView containing |text|.
 + (id<GREYMatcher>)matcherForWebViewContainingText:(const std::string&)text;
 
 // Matcher for WKWebView containing an html element which matches |selector|.
 + (id<GREYMatcher>)matcherForWebWithCSSSelector:(const std::string&)selector;
 
 // Matcher for WKWebView's scroll view.
 + (id<GREYMatcher>)matcherForWebViewScrollView;
 
+// Matcher for WKWebView with given MIME type.
++ (id<GREYMatcher>)matcherForWebViewMIMEType:(const std::string&)MIMEType;
+
 // Matcher for web shell address field text property equal to |text|.
 + (id<GREYMatcher>)matcherForAddressFieldEqualToText:(const std::string&)text;
 
 // Matcher for back button in web shell.
 + (id<GREYMatcher>)matcherForWebShellBackButton;
 
 // Matcher for forward button in web shell.
 + (id<GREYMatcher>)matcherForWebShellForwardButton;
 
 // Matcher for address field in web shell.
 + (id<GREYMatcher>)matcherForWebShellAddressField;
 
 @end