Add a mimeHandler extension API.

extensions/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 
 # GYP version: extensions/extensions.gyp:extensions_browser
 source_set("browser") {
   sources = []
@@ skipping 142 matching lines @@
       "api/hid/hid_connection_resource.cc",
       "api/hid/hid_connection_resource.h",
       "api/hid/hid_device_manager.cc",
       "api/hid/hid_device_manager.h",
       "api/management/management_api.cc",
       "api/management/management_api.h",
       "api/management/management_api_constants.cc",
       "api/management/management_api_constants.h",
       "api/management/management_api_delegate.h",
       "api/messaging/native_message_host.cc",
+      "api/mime_handler_private/mime_handler_private.cc",
+      "api/mime_handler_private/mime_handler_private.h",
       "api/power/power_api.cc",
       "api/power/power_api.h",
       "api/power/power_api_manager.cc",
       "api/power/power_api_manager.h",
       "api/printer_provider_internal/printer_provider_internal_api.cc",
       "api/printer_provider_internal/printer_provider_internal_api.h",
       "api/runtime/runtime_api.cc",
       "api/runtime/runtime_api.h",
       "api/runtime/runtime_api_delegate.cc",
       "api/runtime/runtime_api_delegate.h",
@@ skipping 372 matching lines @@
       sources += [ "api/audio/audio_service_linux.cc" ]
     } else {
       sources += [ "api/audio/audio_service.cc" ]
     }
   }
 
   if (is_win) {
     cflags = [ "/wd4267" ]  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   }
 }