[ios] Added web// public API to let embedder observe loading progress.

ios/web/public/web_state/web_state.h

 // Copyright 2013 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_WEB_STATE_WEB_STATE_H_
 #define IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 21 matching lines @@
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace web {
 
 class BrowserState;
 class NavigationManager;
 class WebInterstitial;
+class WebStateDelegate;
 class WebStateObserver;
 class WebStatePolicyDecider;
 class WebStateWeakPtrFactory;
 
 // Core interface for interaction with the web.
 class WebState : public base::SupportsUserData {
  public:
   // Parameters for the OpenURL() method.
   struct OpenURLParams {
     OpenURLParams(const GURL& url,
@@ skipping 25 matching lines @@
       const std::vector<SkBitmap>&, /* bitmaps */
       /* The sizes in pixel of the bitmaps before they were resized due to the
          max bitmap size passed to DownloadImage(). Each entry in the bitmaps
          vector corresponds to an entry in the sizes vector. If a bitmap was
          resized, there should be a single returned bitmap. */
       const std::vector<gfx::Size>&)>
           ImageDownloadCallback;
 
   ~WebState() override {}
 
+  // Gets/Sets the delegate.
+  virtual WebStateDelegate* GetDelegate() = 0;
+  virtual void SetDelegate(WebStateDelegate* delegate) = 0;
+
   // The view containing the contents of the current web page. If the view has
   // been purged due to low memory, this will recreate it. It is up to the
   // caller to size the view.
   virtual UIView* GetView() = 0;
 
   // Gets the BrowserState associated with this WebState. Can never return null.
   virtual BrowserState* GetBrowserState() const = 0;
 
   // Opens a URL with the given disposition.  The transition specifies how this
   // navigation should be recorded in the history system (for example, typed).
@@ skipping 119 matching lines @@
 
   // Returns a WeakPtr<WebState> to the current WebState. Must remain private
   // and only call must be in WebStateWeakPtrFactory. Please consult that class
   // for more details. Remove as part of http://crbug.com/556736.
   virtual base::WeakPtr<WebState> AsWeakPtr() = 0;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_H_