[ios] Snapshot for WebState

ios/web/public/test/fakes/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_FAKES_TEST_WEB_STATE_H_
 #define IOS_WEB_PUBLIC_TEST_FAKES_TEST_WEB_STATE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 58 matching lines @@
   void OnCreditCardInputShownOnHttp() override {}
 
   void AddObserver(WebStateObserver* observer) override;
 
   void RemoveObserver(WebStateObserver* observer) override;
 
   void AddPolicyDecider(WebStatePolicyDecider* decider) override {}
   void RemovePolicyDecider(WebStatePolicyDecider* decider) override {}
   WebStateInterfaceProvider* GetWebStateInterfaceProvider() override;
   bool HasOpener() const override;
+  void TakeSnapshot(const SnapshotCallback& callback,
+                    const CGSize target_size) const override;

[Eugene But (OOO till 7-30), 2017/06/23 20:36:17]

Optional nit: I think it is super uncommon to have const near value argument in
the header. AFAIK this is because compiler does not actually check if the
argument is const for method predeclaration.

   base::WeakPtr<WebState> AsWeakPtr() override;
 
   // Setters for test data.
   void SetBrowserState(BrowserState* browser_state);
   void SetContentIsHTML(bool content_is_html);
   void SetLoading(bool is_loading);
   void SetCurrentURL(const GURL& url);
   void SetTrustLevel(URLVerificationTrustLevel trust_level);
   void SetNavigationManager(
       std::unique_ptr<NavigationManager> navigation_manager);
@@ skipping 21 matching lines @@
   std::unique_ptr<NavigationManager> navigation_manager_;
   UIView* view_;
 
   // A list of observers notified when page state changes. Weak references.
   base::ObserverList<WebStateObserver, true> observers_;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_TEST_FAKES_TEST_WEB_STATE_H_