Add WebRTC logging extension API.

chrome/chrome_browser_extensions.gypi

Index: chrome/chrome_browser_extensions.gypi
diff --git a/chrome/chrome_browser_extensions.gypi b/chrome/chrome_browser_extensions.gypi
index 96c53c8fd173da5b542948db93f7565c85852340..f3a210258b7baba6c384d55982837424c8886419 100644
--- a/chrome/chrome_browser_extensions.gypi
+++ b/chrome/chrome_browser_extensions.gypi
@@ -594,6 +594,8 @@
         'browser/extensions/api/web_request/web_request_permissions.h',
         'browser/extensions/api/web_request/web_request_time_tracker.cc',
         'browser/extensions/api/web_request/web_request_time_tracker.h',
+        'browser/extensions/api/webrtc_logging_private/webrtc_logging_private_api.cc',
+        'browser/extensions/api/webrtc_logging_private/webrtc_logging_private_api.h',
         'browser/extensions/api/webstore_private/webstore_private_api.cc',
         'browser/extensions/api/webstore_private/webstore_private_api.h',
         'browser/extensions/api/webview/webview_api.cc',
@@ -1090,6 +1092,12 @@
             'browser/extensions/api/braille_display_private/brlapi_connection.cc',
           ],
         }],
+        ['enable_webrtc==0', {
+          'sources!': [
+            'browser/extensions/api/webrtc_logging_private/webrtc_logging_private_api.cc',
+            'browser/extensions/api/webrtc_logging_private/webrtc_logging_private_api.h',
+          ],
+        }],
       ],
     },
   ],