Add a "Simplify Page" option to the print preview dialog

components/dom_distiller/content/distiller_page_web_contents.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_CONTENT_DISTILLER_PAGE_WEB_CONTENTS_H_
 #define COMPONENTS_DOM_DISTILLER_CONTENT_DISTILLER_PAGE_WEB_CONTENTS_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "components/dom_distiller/core/distiller_page.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "url/gurl.h"
 
 namespace dom_distiller {
 
 class SourcePageHandleWebContents : public SourcePageHandle {
  public:
   explicit SourcePageHandleWebContents(
       scoped_ptr<content::WebContents> web_contents);
   ~SourcePageHandleWebContents() override;
 
-  scoped_ptr<content::WebContents> GetWebContents();
+  content::WebContents* GetWebContents() const override;
 
  private:
   // The WebContents this class owns.
   scoped_ptr<content::WebContents> web_contents_;
 };
 
+class SourcePageHandleWebContentsWeakPtr : public SourcePageHandle {
+ public:
+  explicit SourcePageHandleWebContentsWeakPtr(
+      content::WebContents* web_contents);
+  ~SourcePageHandleWebContentsWeakPtr() override;
+
+  content::WebContents* GetWebContents() const override;
+
+ private:
+  base::WeakPtrFactory<content::WebContents> weak_factory_;
+
+  // The WebContents this class refs.
+  base::WeakPtr<content::WebContents> web_contents_;
+};
+
 class DistillerPageWebContentsFactory : public DistillerPageFactory {
  public:
   explicit DistillerPageWebContentsFactory(
       content::BrowserContext* browser_context)
       : DistillerPageFactory(), browser_context_(browser_context) {}
   ~DistillerPageWebContentsFactory() override {}
 
   scoped_ptr<DistillerPage> CreateDistillerPage(
       const gfx::Size& render_view_size) const override;
   scoped_ptr<DistillerPage> CreateDistillerPageWithHandle(
       scoped_ptr<SourcePageHandle> handle) const override;
 
  private:
   content::BrowserContext* browser_context_;
 };
 
 class DistillerPageWebContents : public DistillerPage,
                                  public content::WebContentsDelegate,
                                  public content::WebContentsObserver {
  public:
   DistillerPageWebContents(
       content::BrowserContext* browser_context,
+      const gfx::Size& render_view_size);
+  DistillerPageWebContents(
+      content::BrowserContext* browser_context,
       const gfx::Size& render_view_size,
-      scoped_ptr<SourcePageHandleWebContents> optional_web_contents_handle);
+      scoped_ptr<SourcePageHandle> optional_web_contents_handle);
   ~DistillerPageWebContents() override;
 
   // content::WebContentsDelegate implementation.
   gfx::Size GetSizeForNewRenderView(
       content::WebContents* web_contents) const override;
 
   // content::WebContentsObserver implementation.
   void DocumentLoadedInFrame(
       content::RenderFrameHost* render_frame_host) override;
 
@@ skipping 33 matching lines @@
   // Called when the distillation is done or if the page load failed.
   void OnWebContentsDistillationDone(const GURL& page_url,
                                      const base::Value* value);
 
   // The current state of the |DistillerPage|, initially |IDLE|.
   State state_;
 
   // The JavaScript to inject to extract content.
   std::string script_;
 
-  scoped_ptr<content::WebContents> web_contents_;
+  scoped_ptr<SourcePageHandle> web_contents_handle_;
   content::BrowserContext* browser_context_;
   gfx::Size render_view_size_;
+  base::WeakPtrFactory<DistillerPageWebContents> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(DistillerPageWebContents);
 };
 
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_CONTENT_DISTILLER_PAGE_WEB_CONTENTS_H_