Implemented stub ShareService mojo service, for navigator.share.

chrome/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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 1280 matching lines @@
     "usb/usb_chooser_context_factory.cc",
     "usb/usb_chooser_context_factory.h",
     "usb/usb_tab_helper.cc",
     "usb/usb_tab_helper.h",
     "usb/web_usb_histograms.cc",
     "usb/web_usb_histograms.h",
     "usb/web_usb_permission_provider.cc",
     "usb/web_usb_permission_provider.h",
     "web_data_service_factory.cc",
     "web_data_service_factory.h",
+    "webshare/share_service_impl.cc",
+    "webshare/share_service_impl.h",
     "win/app_icon.cc",
     "win/app_icon.h",
     "win/browser_util.cc",
     "win/browser_util.h",
     "win/chrome_elf_init.cc",
     "win/chrome_elf_init.h",
     "win/chrome_select_file_dialog_factory.cc",
     "win/chrome_select_file_dialog_factory.h",
     "win/enumerate_modules_model.cc",
     "win/enumerate_modules_model.h",
@@ skipping 3142 matching lines @@
   # linking all of the test support.
   static_library("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }