Interpret '?' and Ctrl-K or Ctrl-E as putting omnibox in keyword search mode for Default Search Pro…

components/omnibox/browser/history_quick_provider.cc

 // Copyright (c) 2012 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 "components/omnibox/browser/history_quick_provider.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 31 matching lines @@
       in_memory_url_index_(client->GetInMemoryURLIndex()) {
 }
 
 void HistoryQuickProvider::Start(const AutocompleteInput& input,
                                  bool minimal_changes) {
   TRACE_EVENT0("omnibox", "HistoryQuickProvider::Start");
   matches_.clear();
   if (disabled_ || input.from_omnibox_focus())
     return;
 
-  // Don't bother with INVALID and FORCED_QUERY.
-  if ((input.type() == metrics::OmniboxInputType::INVALID) ||
-      (input.type() == metrics::OmniboxInputType::FORCED_QUERY))
+  // Don't bother with INVALID.
+  if ((input.type() == metrics::OmniboxInputType::INVALID))
     return;
 
   autocomplete_input_ = input;
 
   // TODO(pkasting): We should just block here until this loads.  Any time
   // someone unloads the history backend, we'll get inconsistent inline
   // autocomplete behavior here.
   if (in_memory_url_index_) {
     DoAutocomplete();
   }
@@ skipping 186 matching lines @@
   match.description = info.title();
   match.description_class = SpansFromTermMatch(
       history_match.title_matches, match.description.length(), false);
 
   match.RecordAdditionalInfo("typed count", info.typed_count());
   match.RecordAdditionalInfo("visit count", info.visit_count());
   match.RecordAdditionalInfo("last visit", info.last_visit());
 
   return match;
 }