[Contextual Search] Fetch and display thumbnails returned in resolution response

chrome/browser/android/contextualsearch/contextual_search_delegate.cc

Index: chrome/browser/android/contextualsearch/contextual_search_delegate.cc
diff --git a/chrome/browser/android/contextualsearch/contextual_search_delegate.cc b/chrome/browser/android/contextualsearch/contextual_search_delegate.cc
index bf28538f72f37adc783d9d0315f8935c52ff64fa..674bdbd3c1f5457449edada56787f1fb2eec9663 100644
--- a/chrome/browser/android/contextualsearch/contextual_search_delegate.cc
+++ b/chrome/browser/android/contextualsearch/contextual_search_delegate.cc
@@ -164,10 +164,12 @@ ContextualSearchDelegate::GetResolvedSearchTermFromJson(
   int start_adjust = 0;
   int end_adjust = 0;
   std::string context_language;
+  std::string thumbnail_url = "";
 
   DecodeSearchTermFromJsonResponse(
       json_string, &search_term, &display_text, &alternate_term, &mid,
-      &prevent_preload, &mention_start, &mention_end, &context_language);
+      &prevent_preload, &mention_start, &mention_end, &context_language,
+      &thumbnail_url);
   if (mention_start != 0 || mention_end != 0) {
     // Sanity check that our selection is non-zero and it is less than
     // 100 characters as that would make contextual search bar hide.
@@ -188,7 +190,7 @@ ContextualSearchDelegate::GetResolvedSearchTermFromJson(
   return std::unique_ptr<ResolvedSearchTerm>(new ResolvedSearchTerm(
       is_invalid, response_code, search_term, display_text, alternate_term, mid,
       prevent_preload == kDoPreventPreloadValue, start_adjust, end_adjust,
-      context_language));
+      context_language, thumbnail_url));
 }
 
 std::string ContextualSearchDelegate::BuildRequestUrl(std::string selection) {
@@ -436,7 +438,8 @@ void ContextualSearchDelegate::DecodeSearchTermFromJsonResponse(
     std::string* prevent_preload,
     int* mention_start,
     int* mention_end,
-    std::string* lang) {
+    std::string* lang,
+    std::string* thumbnail_url) {
   bool contains_xssi_escape =
       base::StartsWith(response, kXssiEscape, base::CompareCase::SENSITIVE);
   const std::string& proper_json =
@@ -482,6 +485,8 @@ void ContextualSearchDelegate::DecodeSearchTermFromJsonResponse(
       *alternate_term = resolved_term;
     }
   }
+
+  // TODO(donnd): extract thumbnail_url. Also extract caption and pipe through.
 }
 
 // Extract the Start/End of the mentions in the surrounding text