Add support for multipage distillation.

components/dom_distiller/core/distiller_page.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_CORE_DISTILLER_PAGE_H_
 #define COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_PAGE_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "url/gurl.h"
 
 namespace dom_distiller {
 
 // Injects JavaScript into a page, and uses it to extract and return long-form
 // content. The class can be reused to load and distill multiple pages,
 // following the state transitions described along with the class's states.
 class DistillerPage {
  public:
   class Delegate {
    public:
     virtual ~Delegate() {}
     virtual void OnLoadURLDone() {}
-    virtual void OnExecuteJavaScriptDone(const base::Value* value) {}
+    virtual void OnExecuteJavaScriptDone(const GURL& page_url,
+                                         const base::Value* value) {}
   };
 
   explicit DistillerPage(Delegate* delegate);
 
   virtual ~DistillerPage();
 
 
   // Initializes a |DistillerPage|. It must be called before any
   // other functions, and must only be called once.
   void Init();
 
   // Loads a URL. |OnLoadURLDone| is called when the load completes or fails.
   // May be called when the distiller is idle or a page is available.
   void LoadURL(const GURL& url);
   virtual void OnLoadURLDone();
   virtual void OnLoadURLFailed();
 
   // Injects and executes JavaScript in the context of a loaded page. |LoadURL|
   // must complete before this function is called. May be called only when
   // a page is available.
   void ExecuteJavaScript(const std::string& script);
 
-  // Called when the JavaScript execution completes. |value| contains data
-  // returned by the script.
-  virtual void OnExecuteJavaScriptDone(const base::Value* value);
+  // Called when the JavaScript execution completes. |page_url| is the url of
+  // the distilled page. |value| contains data returned by the script.
+  virtual void OnExecuteJavaScriptDone(const GURL& page_url,
+                                       const base::Value* value);
 
  protected:
   enum State {
     // No context has yet been set in which to load or distill a page.
     NO_CONTEXT,
     // The page distiller has been initialized and is idle.
     IDLE,
     // A page is currently loading.
     LOADING_PAGE,
     // A page has loaded within the specified context.
@@ skipping 32 matching lines @@
  public:
   virtual ~DistillerPageFactory();
 
   virtual scoped_ptr<DistillerPage> CreateDistillerPage(
       DistillerPage::Delegate* delegate) const = 0;
 };
 
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_PAGE_H_