Add ContentSuggestionsService

components/ntp_snippets/content_suggestion.h

Index: components/ntp_snippets/content_suggestion.h
diff --git a/components/ntp_snippets/content_suggestion.h b/components/ntp_snippets/content_suggestion.h
index 60ab27285d39153f84cbc3440fa5346646f6a7d5..033cfef6d9e9e98cc1b3ec0a4012728dfcb5e3a7 100644
--- a/components/ntp_snippets/content_suggestion.h
+++ b/components/ntp_snippets/content_suggestion.h
@@ -12,7 +12,6 @@
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "components/ntp_snippets/content_suggestion_category.h"
-#include "components/ntp_snippets/content_suggestions_provider_type.h"
 #include "url/gurl.h"
 
 namespace ntp_snippets {
@@ -23,21 +22,22 @@ namespace ntp_snippets {
 // (see ntp_snippet.h).
 class ContentSuggestion {
  public:
+  // This is the constructor that should be used by providers.
+  // The caller must ensure that the |id| passed in here is unique
+  // application-wide. Note: The provider should use its ::MakeUniqueID()
+  // function to create the ID.
   ContentSuggestion(const std::string& id,
-                    const ContentSuggestionsProviderType provider,
                     const ContentSuggestionCategory category,
                     const GURL& url);
+  ContentSuggestion(ContentSuggestion&&);
+  ContentSuggestion& operator=(ContentSuggestion&&);
 
   ~ContentSuggestion();
 
   // An ID for identifying the suggestion. The ID is unique among all
-  // suggestions from the same provider, so to determine a globally unique
-  // identifier, combine this ID with the provider type.
+  // suggestions of all providers.
   const std::string& id() const { return id_; }
 
-  // The provider that created this suggestion.
-  ContentSuggestionsProviderType provider() const { return provider_; }
-
   // The category that this suggestion belongs to.
   ContentSuggestionCategory category() const { return category_; }
 
@@ -82,7 +82,6 @@ class ContentSuggestion {
 
  private:
   std::string id_;
-  ContentSuggestionsProviderType provider_;
   ContentSuggestionCategory category_;
   GURL url_;
   GURL amp_url_;