Omnibox - Make Clipboard Provider Enabled via an Experimental Feature

components/omnibox/browser/autocomplete_classifier.h

 // 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.
 
 #ifndef COMPONENTS_OMNIBOX_BROWSER_AUTOCOMPLETE_CLASSIFIER_H_
 #define COMPONENTS_OMNIBOX_BROWSER_AUTOCOMPLETE_CLASSIFIER_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/metrics/proto/omnibox_event.pb.h"
 #include "components/omnibox/browser/autocomplete_scheme_classifier.h"
 
 class AutocompleteController;
 struct AutocompleteMatch;
 class GURL;
 
 class AutocompleteClassifier : public KeyedService {
  public:
   // Bitmap of AutocompleteProvider::Type values describing the default set of
   // providers queried for the omnibox.  Intended to be passed to
   // AutocompleteController().
-  static const int kDefaultOmniboxProviders;
+  static int DefaultOmniboxProviders();

[Mark P, 2017/02/28 23:06:02]

TODO(mpearson): after review, move this down to line 36 (i.e., just below
Shutdown()) and move the implementation correspondingly.  I left it in the
current place for the moment to make this easier to review.

 
   AutocompleteClassifier(
       std::unique_ptr<AutocompleteController> controller_,
       std::unique_ptr<AutocompleteSchemeClassifier> scheme_classifier);
   ~AutocompleteClassifier() override;
 
   // KeyedService:
   void Shutdown() override;
 
   // Given some string |text| that the user wants to use for navigation,
@@ skipping 25 matching lines @@
   std::unique_ptr<AutocompleteSchemeClassifier> scheme_classifier_;
 
   // Are we currently in Classify? Used to verify Classify isn't invoked
   // recursively, since this can corrupt state and cause crashes.
   bool inside_classify_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AutocompleteClassifier);
 };
 
 #endif  // COMPONENTS_OMNIBOX_BROWSER_AUTOCOMPLETE_CLASSIFIER_H_