[ios] Added API to enable/disable web usage for WebState.

ios/web/public/test/test_web_state.h

 // Copyright 2014 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_WEB_PUBLIC_TEST_TEST_WEB_STATE_H_
 #define IOS_WEB_PUBLIC_TEST_TEST_WEB_STATE_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/strings/string16.h"
 #include "ios/web/public/web_state/url_verification_constants.h"
 #include "ios/web/public/web_state/web_state.h"
 #include "url/gurl.h"
 
 namespace web {
 
 // Minimal implementation of WebState, to be used in tests.
 class TestWebState : public WebState {
  public:
   TestWebState();
   ~TestWebState() override;
 
   // WebState implementation.
-  UIView* GetView() override;
   WebStateDelegate* GetDelegate() override;
   void SetDelegate(WebStateDelegate* delegate) override;
+  bool IsWebUsageEnabled() const override;
+  void SetWebUsageEnabled(bool enabled) override;
+  UIView* GetView() override;
   BrowserState* GetBrowserState() const override;
   void OpenURL(const OpenURLParams& params) override {}
   NavigationManager* GetNavigationManager() override;
   CRWJSInjectionReceiver* GetJSInjectionReceiver() const override;
   void ExecuteJavaScript(const base::string16& javascript) override;
   void ExecuteJavaScript(const base::string16& javascript,
                          const JavaScriptResultCallback& callback) override;
   const std::string& GetContentsMimeType() const override;
   const std::string& GetContentLanguageHeader() const override;
   bool ContentIsHTML() const override;
@@ skipping 22 matching lines @@
                     bool bypass_cache,
                     const ImageDownloadCallback& callback) override;
   base::WeakPtr<WebState> AsWeakPtr() override;
 
   // Setters for test data.
   void SetContentIsHTML(bool content_is_html);
   void SetCurrentURL(const GURL& url);
   void SetTrustLevel(URLVerificationTrustLevel trust_level);
 
  private:
+  bool web_usage_enabled_;
   GURL url_;
   base::string16 title_;
   URLVerificationTrustLevel trust_level_;
   bool content_is_html_;
   std::string mime_type_;
   std::string content_language_;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_TEST_TEST_WEB_STATE_H_