Add decode() functionality to image elements.

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 3481 matching lines @@
   CancelPagePopup();
 }
 
 WebInputMethodController* WebViewImpl::GetActiveWebInputMethodController()
     const {
   WebLocalFrameBase* local_frame =
       WebLocalFrameBase::FromFrame(FocusedLocalFrameInWidget());
   return local_frame ? local_frame->GetInputMethodController() : nullptr;
 }
 
+void WebViewImpl::RequestDecode(
+    sk_sp<SkImage> image,
+    std::unique_ptr<WTF::Function<void(bool)>> callback) {
+  layer_tree_view_->RequestDecode(std::move(image),
+                                  ConvertToBaseCallback(std::move(callback)));
+}
+
 Color WebViewImpl::BaseBackgroundColor() const {
   return base_background_color_override_enabled_
              ? base_background_color_override_
              : base_background_color_;
 }
 
 void WebViewImpl::SetBaseBackgroundColor(WebColor color) {
   if (base_background_color_ == color)
     return;
 
@@ skipping 616 matching lines @@
   if (focused_frame->LocalFrameRoot() != MainFrameImpl()->GetFrame())
     return nullptr;
   return focused_frame;
 }
 
 LocalFrame* WebViewImpl::FocusedLocalFrameAvailableForIme() const {
   return ime_accept_events_ ? FocusedLocalFrameInWidget() : nullptr;
 }
 
 }  // namespace blink