Quick Answers: Add page size options for Search request

Since we only use the first result from search request, set the page
size to 1 to reduce the delay.

Bug: b/173239982
Test: None
Change-Id: Ib2abd92e23b430b837f0556c31bcc0d17873256e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2574072Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Jeroen Dhollander <jeroendh@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Yue Li <updowndota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833940}

chromeos/components/quick_answers/search_result_loader.cc

@@ -30,6 +30,9 @@ using network::mojom::URLLoaderFactory;
 //   "client_id": {
 //     "client_type": "EXPERIMENTAL"
 //   }
+//   "options": {
+//     "page_size": "1"
+//   }
 // }
 //
 // Which is:
@@ -38,12 +41,17 @@ using network::mojom::URLLoaderFactory;
 //      "raw_query": STRING
 //   "client_id": DICT
 //       "client_type": STRING
+//   "options": DICT
+//       "page_size": STRING
 
 constexpr base::StringPiece kQueryKey = "query";
 constexpr base::StringPiece kRawQueryKey = "rawQuery";
 constexpr base::StringPiece kClientTypeKey = "clientType";
 constexpr base::StringPiece kClientIdKey = "clientId";
 constexpr base::StringPiece kClientType = "QUICK_ANSWERS_CROS";
+constexpr base::StringPiece kPageSizeKey = "pageSize";
+constexpr base::StringPiece kOptionsKey = "options";
+constexpr base::StringPiece kPageSize = "1";
 
 std::string BuildSearchRequestPayload(const std::string& selected_text) {
   Value payload(Value::Type::DICTIONARY);
@@ -57,6 +65,10 @@ std::string BuildSearchRequestPayload(const std::string& selected_text) {
   client_id.SetKey(kClientTypeKey, Value(kClientType));
   payload.SetKey(kClientIdKey, std::move(client_id));
 
+  Value options(Value::Type::DICTIONARY);
+  options.SetKey(kPageSizeKey, Value(kPageSize));
+  payload.SetKey(kOptionsKey, std::move(options));
+
   std::string request_payload_str;
   base::JSONWriter::Write(payload, &request_payload_str);