[dom_distiller] Add support for incremental viewer.

components/dom_distiller/core/viewer.h

Index: components/dom_distiller/core/viewer.h
diff --git a/components/dom_distiller/core/viewer.h b/components/dom_distiller/core/viewer.h
index 61aac1481605c6839512b4173b30b2b2245f467a..bab3d6a4c140edd4d11fc7135246d9658713fbec 100644
--- a/components/dom_distiller/core/viewer.h
+++ b/components/dom_distiller/core/viewer.h
@@ -10,10 +10,12 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/strings/string16.h"
 
 namespace dom_distiller {
 
 class DistilledArticleProto;
+class DistilledPageProto;
 class DomDistillerServiceInterface;
 class ViewerHandle;
 class ViewRequestDelegate;
@@ -23,7 +25,17 @@ namespace viewer {
 // Returns a full HTML page based on the given |article_proto|. This is supposed
 // to displayed to the end user. The returned HTML should be considered unsafe,
 // so callers must ensure rendering it does not compromise Chrome.
-const std::string GetUnsafeHtml(const DistilledArticleProto* article_proto);
+const std::string GetUnsafeArticleHtml(
+    const DistilledArticleProto* article_proto);
+
+const std::string GetUnsafePartialArticleHtml(
+    const DistilledPageProto* page_proto);
+
+const base::string16 GetUnsafeIncrementalDistilledPageJs(
+    const DistilledPageProto* page_proto,
+    const bool is_last_page);
+
+const base::string16 GetToggleLoadingIndicatorJs(const bool is_last_page);
 
 // Returns a full HTML page which displays a generic error.
 const std::string GetErrorPageHtml();
@@ -31,6 +43,8 @@ const std::string GetErrorPageHtml();
 // Returns the default CSS to be used for a viewer.
 const std::string GetCss();
 
+const std::string GetJavaScript();
+
 // Based on the given path, calls into the DomDistillerServiceInterface for
 // viewing distilled content based on the |path|.
 scoped_ptr<ViewerHandle> CreateViewRequest(