[ios] Snapshot for WebState

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 17 matching lines @@
 @protocol CRWWebViewProxy;
 typedef id<CRWWebViewProxy> CRWWebViewProxyType;
 @class UIView;
 typedef UIView<CRWScrollableContent> CRWContentView;
 
 namespace base {
 class DictionaryValue;
 class Value;
 }
 
+namespace gfx {
+class Image;
+}
+
 namespace web {
 
 class BrowserState;
 class NavigationManager;
 class SessionCertificatePolicyCache;
 class WebInterstitial;
 class WebStateDelegate;
 class WebStateInterfaceProvider;
 class WebStateObserver;
 class WebStatePolicyDecider;
@@ skipping 193 matching lines @@
   // Returns the current CRWWebViewProxy object.
   virtual CRWWebViewProxyType GetWebViewProxy() const = 0;
 
   // Returns Mojo interface registry for this WebState.
   virtual WebStateInterfaceProvider* GetWebStateInterfaceProvider() = 0;
 
   // Returns whether this WebState was created with an opener.  See
   // CreateParams::created_with_opener for more details.
   virtual bool HasOpener() const = 0;
 
+  // Callback used to handle snapshots. The parameter is the snapshot image.
+  typedef base::Callback<void(const gfx::Image&)> SnapshotCallback;
+
+  // Takes a snapshot of this WebState with |target_size|. |callback| is
+  // asynchronously invoked after performing the snapshot.
+  virtual void TakeSnapshot(const SnapshotCallback& callback,
+                            CGSize target_size) const = 0;
+
  protected:
   friend class WebStateObserver;
   friend class WebStatePolicyDecider;
 
   // Adds and removes observers for page navigation notifications. The order in
   // which notifications are sent to observers is undefined. Clients must be
   // sure to remove the observer before they go away.
   // TODO(droger): Move these methods to WebStateImpl once it is in ios/.
   virtual void AddObserver(WebStateObserver* observer) = 0;
   virtual void RemoveObserver(WebStateObserver* observer) = 0;
@@ skipping 12 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_