Allow getting _only_ personalized snippets for NTP.

components/ntp_snippets/ntp_snippets_fetcher.h

Index: components/ntp_snippets/ntp_snippets_fetcher.h
diff --git a/components/ntp_snippets/ntp_snippets_fetcher.h b/components/ntp_snippets/ntp_snippets_fetcher.h
index 533f557d4981371ece78766c01950792cede9387..3c1a2608bbd0e4daa1bb0938e516752536c78464 100644
--- a/components/ntp_snippets/ntp_snippets_fetcher.h
+++ b/components/ntp_snippets/ntp_snippets_fetcher.h
@@ -99,7 +99,7 @@ class NTPSnippetsFetcher : public OAuth2TokenService::Consumer,
   }
 
  private:
-  enum class Variant { kRestrictedPersonalized, kRestricted, kPersonalized };
+  enum class Variant { kPersonalized, kNonPersonalized, kAll };

[Marc Treib, 2016/05/12 08:59:16]

Can we rename "Variant" to something more meaningful now? "Personalization" with
values kYes, kNo, kBoth, something like that?

[jkrcal, 2016/05/12 09:57:29]

Done. I did not like kYes, kNo, kBoth - Yes and No sound too exclusive to be
combined into Both.

[Marc Treib, 2016/05/12 10:06:15]

Yup, yours are better, thanks!

 
   void FetchSnippetsImpl(const GURL& url,
                          const std::string& auth_header,
@@ -163,8 +163,10 @@ class NTPSnippetsFetcher : public OAuth2TokenService::Consumer,
   // Flag for picking the right (stable/non-stable) API key for Chrome Reader.
   bool is_stable_channel_;
 
-  // The variant of the fetching to use.
+  // The variant of the fetching to use, loaded from variation parameters.
   Variant variant_;
+  // Should we apply host restriction? It is loaded from variation parameters.
+  bool use_host_restriction_;
 
   // Allow for an injectable tick clock for testing.
   std::unique_ptr<base::TickClock> tick_clock_;