Implement chrome.brailleDisplayPrivate API

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index c2d0ff6d7d3db9a16d9d8aceb6eb6a92bd921008..a78eb881c682cfe8e2a39e2c97defbf6f44fa312 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -1308,6 +1308,7 @@
         'browser/extensions/api/autotest_private/autotest_private_apitest.cc',
         'browser/extensions/api/bluetooth/bluetooth_apitest.cc',
         'browser/extensions/api/bookmark_manager_private/bookmark_manager_private_apitest.cc',
+        'browser/extensions/api/braille_display_private/braille_display_private_apitest.cc',
         'browser/extensions/api/bookmarks/bookmark_apitest.cc',
         'browser/extensions/api/browsing_data/browsing_data_test.cc',
         'browser/extensions/api/cloud_print_private/cloud_print_private_apitest.cc',
@@ -2147,6 +2148,11 @@
             'browser/ui/webui/local_discovery/local_discovery_ui_browsertest.cc',
           ]
         }],
+        [ 'use_brlapi==0', {
+          'sources!': [
+            'browser/extensions/api/braille_display_private/braille_display_private_apitest.cc'
+            ]
+        }],
       ],  # conditions
     },  # target browser_tests
     {