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

components/dom_distiller/content/distiller_page_web_contents.h

Index: components/dom_distiller/content/distiller_page_web_contents.h
diff --git a/components/dom_distiller/content/distiller_page_web_contents.h b/components/dom_distiller/content/distiller_page_web_contents.h
index 80b7a9eb800f52954d81556f19249c955b0fd748..03e825ba8347d4d0b62e6ba938caf3c3a4ae8b1f 100644
--- a/components/dom_distiller/content/distiller_page_web_contents.h
+++ b/components/dom_distiller/content/distiller_page_web_contents.h
@@ -8,6 +8,7 @@
 #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"
@@ -22,13 +23,28 @@ class SourcePageHandleWebContents : public SourcePageHandle {
       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(
@@ -51,8 +67,11 @@ class DistillerPageWebContents : public DistillerPage,
  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.
@@ -106,9 +125,11 @@ class DistillerPageWebContents : public DistillerPage,
   // 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);
 };