Add the scheme chrome-distiller:// and hook up data source.

components/dom_distiller/webui/dom_distiller_viewer_handler.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 COMPONENTS_DOM_DISTILLER_WEBUI_DOM_DISTILLER_VIEWER_HANDLER_H_
+#define COMPONENTS_DOM_DISTILLER_WEBUI_DOM_DISTILLER_VIEWER_HANDLER_H_
+
+#include <vector>
+
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_ui_message_handler.h"
+#include "url/gurl.h"
+
+namespace dom_distiller {
+
+class DistilledPageProto;
+class DomDistillerService;
+class ViewerHandle;
+
+// Handler class for DOM Distiller viewing operations.
+class DomDistillerViewerHandler : public content::WebUIMessageHandler,
+                                  public content::WebContentsObserver {
+ public:
+  DomDistillerViewerHandler(const GURL& url,
+                            content::WebContents* web_contents);
+  virtual ~DomDistillerViewerHandler();
+
+  // content::WebUIMessageHandler implementation.
+  virtual void RegisterMessages() OVERRIDE;
+
+  // content::WebContentsObserver implementation.
+  virtual void DidFinishLoad(
+      int64 frame_num,
+      const GURL& validated_url,
+      bool is_main_frame,
+      content::RenderViewHost* render_view_host) OVERRIDE;
+  virtual void DidFailLoad(
+      int64 frame_num,
+      const GURL& validated_url,
+      bool is_main_frame,
+      int error_code,
+      const string16& error_description,
+      content::RenderViewHost* render_view_host) OVERRIDE;
+
+ private:
+  // Factory for the creating refs in callbacks.
+  base::WeakPtrFactory<DomDistillerViewerHandler> weak_ptr_factory_;
+
+  // The URL of the current WebUI.
+  const GURL url_;
+
+  DISALLOW_COPY_AND_ASSIGN(DomDistillerViewerHandler);
+};
+
+}  // namespace dom_distiller
+
+#endif  // COMPONENTS_DOM_DISTILLER_WEBUI_DOM_DISTILLER_VIEWER_HANDLER_H_