cocoa: add experimental tabstrip keyboard focus support

chrome/browser/about_flags.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 "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 2331 matching lines @@
      FEATURE_VALUE_TYPE(chrome::android::kCustomFeedbackUi)},
 #endif  // OS_ANDROID
 
     {"enable-resource-prefetch", IDS_FLAGS_SPECULATIVE_PREFETCH_NAME,
      IDS_FLAGS_SPECULATIVE_PREFETCH_DESCRIPTION, kOsAll,
      FEATURE_WITH_VARIATIONS_VALUE_TYPE(
          predictors::kSpeculativeResourcePrefetchingFeature,
          kSpeculativeResourcePrefetchingFeatureVariations,
          "SpeculativeResourcePrefetchingValidation")},
 
+#if defined(OS_MACOSX)
+    {"tab-strip-keyboard-focus", IDS_FLAGS_TAB_STRIP_KEYBOARD_FOCUS_NAME,
+     IDS_FLAGS_TAB_STRIP_KEYBOARD_FOCUS_DESCRIPTION, kOsMac,
+     FEATURE_VALUE_TYPE(features::kTabStripKeyboardFocus)}
+#endif
+
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
 };
 
 class FlagsStateSingleton {
  public:
   FlagsStateSingleton()
       : flags_state_(kFeatureEntries, arraysize(kFeatureEntries)) {}
   ~FlagsStateSingleton() {}
@@ skipping 188 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags