[TTS] Log a warning when Contextual Cards backend fails.

chrome/browser/android/contextualsearch/contextual_search_delegate.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/contextualsearch/contextual_search_delegate.h"
 
 #include <algorithm>
 
 #include "base/base64.h"
 #include "base/command_line.h"
@@ skipping 483 matching lines @@
     if (resolved_term != *search_term) {
       *alternate_term = resolved_term;
     }
   }
 
   if (field_trial_->IsContextualCardsBarIntegrationEnabled()) {
     // Get the basic Bar data for Contextual Cards integration directly
     // from the root.
     dict->GetString(kContextualSearchCaption, caption);
     dict->GetString(kContextualSearchThumbnail, thumbnail_url);
+    // For testing purposes check if there was a coca backend failure and
+    // flag that in the log.
+    // TODO(donnd): remove after full Coca integration.
+    bool contextual_cards_backend_responded = true;
+    dict->GetBoolean("coca_responded", &contextual_cards_backend_responded);
+    if (!contextual_cards_backend_responded) {
+      DVLOG(0) << "";
+      DVLOG(0) << "!!! CONTEXTUAL SEARCH WARNING !!!";
+      DVLOG(0)
+          << "The Contextual Cards backend did not respond to this "
+             "request!!! The backend server may not be configured or is down.";
+      DVLOG(0) << "";
+    }
   }
 }
 
 // Extract the Start/End of the mentions in the surrounding text
 // for selection-expansion.
 void ContextualSearchDelegate::ExtractMentionsStartEnd(
     const base::ListValue& mentions_list,
     int* startResult,
     int* endResult) {
   int int_value;
@@ skipping 23 matching lines @@
     end_offset -= trim;
   }
   if (result_text.length() > end_offset + padding_each_side_pinned) {
     // Trim the end.
     result_text = result_text.substr(0, end_offset + padding_each_side_pinned);
   }
   *start = start_offset;
   *end = end_offset;
   return result_text;
 }