Add decode() functionality to image elements.

third_party/WebKit/Source/core/frame/WebFrameWidgetBase.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.
 
 #ifndef WebFrameWidgetBase_h
 #define WebFrameWidgetBase_h
 
 #include "core/CoreExport.h"
 #include "core/clipboard/DataObject.h"
 #include "core/dom/UserGestureIndicator.h"
@@ skipping 68 matching lines @@
   bool DoingDragAndDrop() { return doing_drag_and_drop_; }
   static void SetIgnoreInputEvents(bool value) { ignore_input_events_ = value; }
   static bool IgnoreInputEvents() { return ignore_input_events_; }
 
   // WebWidget methods.
   void DidAcquirePointerLock() override;
   void DidNotAcquirePointerLock() override;
   void DidLosePointerLock() override;
   void ShowContextMenu(WebMenuSourceType) override;
 
+  // Image decode functionality.
+  void RequestDecode(sk_sp<SkImage>,
+                     std::unique_ptr<WTF::Function<void(bool)>> callback);
+
  protected:
   enum DragAction { kDragEnter, kDragOver };
 
   // Consolidate some common code between starting a drag over a target and
   // updating a drag over a target. If we're starting a drag, |isEntering|
   // should be true.
   WebDragOperation DragTargetDragEnterOrOver(const WebPoint& point_in_viewport,
                                              const WebPoint& screen_point,
                                              DragAction,
                                              int modifiers);
@@ skipping 31 matching lines @@
   RefPtr<UserGestureToken> pointer_lock_gesture_token_;
 
   friend class WebViewImpl;
 };
 
 DEFINE_TYPE_CASTS(WebFrameWidgetBase, WebFrameWidget, widget, true, true);
 
 }  // namespace blink
 
 #endif