Add incremental updates for multipage distillation.

components/dom_distiller/core/fake_distiller.h

Index: components/dom_distiller/core/fake_distiller.h
diff --git a/components/dom_distiller/core/fake_distiller.h b/components/dom_distiller/core/fake_distiller.h
index 98ab7096dc942be44fb1a0841fc913e540b95701..eeadb62a8083a8828c7207d30ff93923a20b42f4 100644
--- a/components/dom_distiller/core/fake_distiller.h
+++ b/components/dom_distiller/core/fake_distiller.h
@@ -5,6 +5,7 @@
 #ifndef COMPONENTS_DOM_DISTILLER_CORE_FAKE_DISTILLER_H_
 #define COMPONENTS_DOM_DISTILLER_CORE_FAKE_DISTILLER_H_
 
+#include "components/dom_distiller/core/article_distillation_update.h"
 #include "components/dom_distiller/core/article_entry.h"
 #include "components/dom_distiller/core/distiller.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ -32,20 +33,25 @@ class FakeDistiller : public Distiller {
   MOCK_METHOD0(Die, void());
 
   virtual void DistillPage(const GURL& url,
-                           const DistillerCallback& callback) OVERRIDE;
+                           const DistillationFinishedCallback& article_callback,
+                           const DistillationUpdateCallback& page_callback)
+      OVERRIDE;
 
   void RunDistillerCallback(scoped_ptr<DistilledArticleProto> proto);
 
   GURL GetUrl() { return url_; }
 
-  DistillerCallback GetCallback() { return callback_; }
+  DistillationFinishedCallback GetArticleCallback() {
+    return article_callback_;
+  }
 
  private:
   void RunDistillerCallbackInternal(scoped_ptr<DistilledArticleProto> proto);
 
   bool execute_callback_;
   GURL url_;
-  DistillerCallback callback_;
+  DistillationFinishedCallback article_callback_;
+  DistillationUpdateCallback page_callback_;
 };
 
 }  // namespace test