[omnibox] Include additional_query_params when deduping in AcMatch.

This is basically a re-land of https://crrev.com/c/1273620 which
restores the old approach to entity suggestions, which is to never
dedupe them with a plain suggestion containing the same query text. By
including additional_query_params, entity suggestions will always be
considered distinct, even if they have the same query text as another
search suggestion.

Bug: 806995
Change-Id: If9b5b5f876259a1289e3eb093bd24935a74dba51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1658510Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681917}

components/omnibox/browser/autocomplete_match.cc

@@ -592,7 +592,8 @@ GURL AutocompleteMatch::GURLToStrippedGURL(
     const GURL& url,
     const AutocompleteInput& input,
     const TemplateURLService* template_url_service,
-    const base::string16& keyword) {
+    const base::string16& keyword,
+    const std::string& additional_query_params) {
   if (!url.is_valid())
     return url;
 
@@ -619,10 +620,12 @@ GURL AutocompleteMatch::GURLToStrippedGURL(
         stripped_destination_url,
         template_url_service->search_terms_data(),
         &search_terms)) {
+      TemplateURLRef::SearchTermsArgs search_terms_args(search_terms);
+      if (!additional_query_params.empty())
+        search_terms_args.additional_query_params = additional_query_params;
       stripped_destination_url =
           GURL(template_url->url_ref().ReplaceSearchTerms(
-              TemplateURLRef::SearchTermsArgs(search_terms),
-              template_url_service->search_terms_data()));
+              search_terms_args, template_url_service->search_terms_data()));
     }
   }
 

components/omnibox/browser/autocomplete_match.h

@@ -259,10 +259,16 @@ struct AutocompleteMatch {
   // - If the match's keyword is known, it can be provided in |keyword|.
   //   Otherwise, it can be left empty and the template URL (if any) is
   //   determined from the destination's hostname.
-  static GURL GURLToStrippedGURL(const GURL& url,
-                                 const AutocompleteInput& input,
-                                 const TemplateURLService* template_url_service,
-                                 const base::string16& keyword);
+  // - If |additional_query_params| is provided, these will be added to the
+  //   resulting URL in the cases where a template URL is used. This is used to
+  //   distinguish cases such as entity suggestions where the response contains
+  //   additional meaningful parameters beyond the search terms themselves.
+  static GURL GURLToStrippedGURL(
+      const GURL& url,
+      const AutocompleteInput& input,
+      const TemplateURLService* template_url_service,
+      const base::string16& keyword,
+      const std::string& additional_query_params = "");
 
   // Sets the |match_in_scheme| and |match_in_subdomain| flags based on the
   // provided |url| and list of substring |match_positions|. |match_positions|