Add ClearHistory() to ContentSuggestionsService and its providers

components/ntp_snippets/content_suggestions_service.h

Index: components/ntp_snippets/content_suggestions_service.h
diff --git a/components/ntp_snippets/content_suggestions_service.h b/components/ntp_snippets/content_suggestions_service.h
index bc8fb932473528d592b68b20f3d265351e4b1398..05ac915f4f7e9ef8dc0c07abc9da0a83c759accd 100644
--- a/components/ntp_snippets/content_suggestions_service.h
+++ b/components/ntp_snippets/content_suggestions_service.h
@@ -13,6 +13,7 @@
 #include "base/callback_forward.h"
 #include "base/observer_list.h"
 #include "base/optional.h"
+#include "base/time/time.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/ntp_snippets/category_factory.h"
 #include "components/ntp_snippets/category_status.h"
@@ -119,6 +120,16 @@ class ContentSuggestionsService : public KeyedService,
   // called only once per provider.
   void RegisterProvider(std::unique_ptr<ContentSuggestionsProvider> provider);
 
+  // Removes history from a given time range related to URLs matched by |filter|
+  // from all providers. The data removed depends on the provider. Note that the
+  // data outside the time range may be deleted, for example suggestions, which
+  // are based on history from that time range. Providers should immediately
+  // clear any data related to history from the specified time range and URLs
+  // matched by |filter|.

[Marc Treib, 2016/08/30 13:01:56]

Same here

[vitaliii, 2016/08/30 14:17:48]

Done.

+  void ClearHistory(base::Time begin,
+                    base::Time end,
+                    base::Callback<bool(const GURL& url)> filter);
+
   // Removes all suggestions from all caches or internal stores in all
   // providers. See |ClearCachedSuggestions|.
   void ClearAllCachedSuggestions();