[dom_distiller] Add support for incremental viewer.

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 8a3dc361dc60e4eece9db42ec496bcebdf91d6a4..9b180eec0080d9dbdb49764ed60e39c51a9491ca 100644
--- a/components/dom_distiller/core/fake_distiller.h
+++ b/components/dom_distiller/core/fake_distiller.h
@@ -13,6 +13,10 @@
 
 class GURL;
 
+namespace content {
+class MessageLoopRunner;
+}
+
 namespace dom_distiller {
 namespace test {
 
@@ -32,6 +36,8 @@ class FakeDistiller : public Distiller {
   // immediately be posted to execute the callback with a simple
   // DistilledArticleProto.
   explicit FakeDistiller(bool execute_callback);
+  explicit FakeDistiller(bool execute_callback,
+                         content::MessageLoopRunner* runner);
   virtual ~FakeDistiller();
   MOCK_METHOD0(Die, void());
 
@@ -42,6 +48,7 @@ class FakeDistiller : public Distiller {
       const DistillationUpdateCallback& page_callback) OVERRIDE;
 
   void RunDistillerCallback(scoped_ptr<DistilledArticleProto> proto);
+  void RunDistillerUpdateCallback(const ArticleDistillationUpdate& update);
 
   GURL GetUrl() { return url_; }
 
@@ -57,8 +64,9 @@ class FakeDistiller : public Distiller {
   GURL url_;
   DistillationFinishedCallback article_callback_;
   DistillationUpdateCallback page_callback_;
-
   bool destruction_allowed_;
+  // Used to notify when distillation is complete.
+  content::MessageLoopRunner* runner_;
 };
 
 }  // namespace test