Add support for providing an external file for extracting content.

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"
@@ skipping 16 matching lines @@
  private:
   // The WebContents this class owns.
   scoped_ptr<content::WebContents> web_contents_;
 };
 
 class DistillerPageWebContentsFactory : public DistillerPageFactory {
  public:
   explicit DistillerPageWebContentsFactory(
       content::BrowserContext* browser_context)
       : DistillerPageFactory(), browser_context_(browser_context) {}
+  DistillerPageWebContentsFactory(content::BrowserContext* browser_context,
+                                  std::string distiller_js_script);
   ~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_;
+  // An optional script for overriding the JS that comes packaged with Chrome.

[cjhopman, 2015/02/07 01:16:48]

I'd say make this non-optional and have the caller supply the one in the pak
file if that's what it wants (and then make it required int the DistillerPage
constructors too).

[nyquist, 2015/03/09 20:40:03]

Done.

+  std::string distiller_js_script_;
 };
 
 class DistillerPageWebContents : public DistillerPage,
                                  public content::WebContentsDelegate,
                                  public content::WebContentsObserver {
  public:
   DistillerPageWebContents(

[cjhopman, 2015/02/07 01:16:48]

shouldn't this constructor take the distiller script?

[nyquist, 2015/03/09 20:40:03]

Done.

       content::BrowserContext* browser_context,
       const gfx::Size& render_view_size,
       scoped_ptr<SourcePageHandleWebContents> optional_web_contents_handle);
   ~DistillerPageWebContents() override;
 
   // content::WebContentsDelegate implementation.
   gfx::Size GetSizeForNewRenderView(
       content::WebContents* web_contents) const override;
 
   // content::WebContentsObserver implementation.
@@ skipping 43 matching lines @@
 
   scoped_ptr<content::WebContents> web_contents_;
   content::BrowserContext* browser_context_;
   gfx::Size render_view_size_;
   DISALLOW_COPY_AND_ASSIGN(DistillerPageWebContents);
 };
 
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_CONTENT_DISTILLER_PAGE_WEB_CONTENTS_H_