Add DisplayType to app list SearchResults

ui/app_list/search_result.h

Index: ui/app_list/search_result.h
diff --git a/ui/app_list/search_result.h b/ui/app_list/search_result.h
index d533b7937fa60e176fa5c9e6672b15c93f53e9a4..f210248d4e03a236306ab16b3ac230b0bff10004 100644
--- a/ui/app_list/search_result.h
+++ b/ui/app_list/search_result.h
@@ -27,6 +27,12 @@ class SearchResultObserver;
 // default style.
 class APP_LIST_EXPORT SearchResult {
  public:
+  // How the result should be displayed.
+  enum DisplayType {
+    DISPLAY_LIST,
+    DISPLAY_TILE,
+  };
+
   // A tagged range in search result text.
   struct APP_LIST_EXPORT Tag {
     // Similar to ACMatchClassification::Style, the style values are not
@@ -90,6 +96,7 @@ class APP_LIST_EXPORT SearchResult {
 
   const std::string& id() const { return id_; }
   double relevance() const { return relevance_; }
+  DisplayType display_type() const { return display_type_; }
 
   const Actions& actions() const {
     return actions_;
@@ -122,6 +129,9 @@ class APP_LIST_EXPORT SearchResult {
  protected:
   void set_id(const std::string& id) { id_ = id; }
   void set_relevance(double relevance) { relevance_ = relevance; }
+  void set_display_type(DisplayType display_type) {
+    display_type_ = display_type;
+  }
 
  private:
   gfx::ImageSkia icon_;
@@ -134,6 +144,7 @@ class APP_LIST_EXPORT SearchResult {
 
   std::string id_;
   double relevance_;
+  DisplayType display_type_;
 
   Actions actions_;