Expose Physical Web metadata to native clients over JNI

components/omnibox/browser/physical_web_provider.cc

 // Copyright (c) 2016 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 "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "components/omnibox/browser/autocomplete_provider_client.h"
 #include "components/omnibox/browser/autocomplete_provider_listener.h"
 #include "components/omnibox/browser/history_url_provider.h"
@@ skipping 88 matching lines @@
   size_t used_slots = 0;
 
   for (size_t i = 0; i < metadata_count; ++i) {
     base::DictionaryValue* metadata_item = NULL;
     if (!metadata_list->GetDictionary(i, &metadata_item)) {
       continue;
     }
 
     std::string url_string;
     std::string title_string;
-    if (!metadata_item->GetString("resolvedUrl", &url_string) ||
-        !metadata_item->GetString("title", &title_string)) {
+    if (!metadata_item->GetString(kPhysicalWebResolvedUrlKey, &url_string) ||
+        !metadata_item->GetString(kPhysicalWebTitleKey, &title_string)) {
       continue;
     }
     base::string16 title =
         AutocompleteMatch::SanitizeString(base::UTF8ToUTF16(title_string));
 
     // Add match items with decreasing relevance to preserve the ordering in
     // the metadata list.
     int relevance = kPhysicalWebUrlBaseRelevance - used_slots;
 
     // Append an overflow item if creating a match for each metadata item would
@@ skipping 59 matching lines @@
       AutocompleteInput::FormattedStringWithEquivalentMeaning(
           url, match.contents, client_->GetSchemeClassifier());
 
   match.description =
       l10n_util::GetStringUTF16(IDS_PHYSICAL_WEB_OVERFLOW_DESCRIPTION);
   match.description_class.push_back(
       ACMatchClassification(0, ACMatchClassification::NONE));
 
   matches_.push_back(match);
 }