Add support for distilling arbitrary URLs in DOM Distiller Viewer.

components/dom_distiller/content/dom_distiller_viewer_source.h

Index: components/dom_distiller/content/dom_distiller_viewer_source.h
diff --git a/components/dom_distiller/content/dom_distiller_viewer_source.h b/components/dom_distiller/content/dom_distiller_viewer_source.h
index eb7559bc20ae18527d94e21e3001ce05809e8cf6..07ec58845213065ddc06fea05d8c81f0a9c76b5a 100644
--- a/components/dom_distiller/content/dom_distiller_viewer_source.h
+++ b/components/dom_distiller/content/dom_distiller_viewer_source.h
@@ -12,6 +12,7 @@
 namespace dom_distiller {
 
 class DomDistillerService;
+class ViewerHandle;
 
 // Serves HTML and resources for viewing distilled articles.
 class DomDistillerViewerSource : public content::URLDataSource {
@@ -21,6 +22,8 @@ class DomDistillerViewerSource : public content::URLDataSource {
   virtual ~DomDistillerViewerSource();
 
  private:
+  class RequestViewerHandle;
+
   // Overridden from content::URLDataSource:
   virtual std::string GetSource() const OVERRIDE;
   virtual void StartDataRequest(
@@ -35,6 +38,10 @@ class DomDistillerViewerSource : public content::URLDataSource {
                                   std::string* path) const OVERRIDE;
   virtual std::string GetContentSecurityPolicyObjectSrc() const OVERRIDE;
 
+  scoped_ptr<ViewerHandle> CreateViewRequest(
+      const std::string& path,
+      RequestViewerHandle* request_viewer_handle);
+
   // The scheme this URLDataSource is hosted under.
   std::string scheme_;