Support action button to fetch more content suggestions

components/ntp_snippets/category_info.h

Index: components/ntp_snippets/category_info.h
diff --git a/components/ntp_snippets/category_info.h b/components/ntp_snippets/category_info.h
index 8ae272e9858446480bfc2c0494a48458c0e2baec..0187209fde93f5a2fa2ebb485ce4ad6ec381cc49 100644
--- a/components/ntp_snippets/category_info.h
+++ b/components/ntp_snippets/category_info.h
@@ -24,7 +24,8 @@ enum class ContentSuggestionsCardLayout {
 class CategoryInfo {
  public:
   CategoryInfo(const base::string16& title,
-               ContentSuggestionsCardLayout card_layout);
+               ContentSuggestionsCardLayout card_layout,
+               bool has_more_button);

[tschumann, 2016/08/12 08:02:39]

can we use an enum instead? kNoMoreButton, kHasMoreButton is much nicer to read
at the calling side.

   CategoryInfo(CategoryInfo&&) = default;
   CategoryInfo& operator=(CategoryInfo&&) = default;
 
@@ -36,9 +37,15 @@ class CategoryInfo {
   // Layout of the cards to be used to display suggestions in this category.
   ContentSuggestionsCardLayout card_layout() const { return card_layout_; }
 
+  // Whether the category supports a "More" button. The button either triggers
+  // a fixed action (like opening a native page) or, if there is no such fixed
+  // action, it queries the provider for more suggestions.
+  bool has_more_button() const { return has_more_button_; }
+
  private:
   base::string16 title_;
   ContentSuggestionsCardLayout card_layout_;
+  bool has_more_button_;
 
   DISALLOW_COPY_AND_ASSIGN(CategoryInfo);
 };