Add webusb notification UI code

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 8c70bbf7310f1b8206e3bc2dbd5fecda4f409276..9a29dc4a0d7abe1c10e6d81d511a6e86b848c47d 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -1008,6 +1008,8 @@
       'browser/chrome_device_client.h',
       'browser/chrome_process_singleton.cc',
       'browser/chrome_process_singleton.h',
+      'browser/chrome_webusb_browser_client.cc',
+      'browser/chrome_webusb_browser_client.h',
       'browser/component_updater/widevine_cdm_component_installer.cc',
       'browser/component_updater/widevine_cdm_component_installer.h',
       'browser/custom_home_pages_table_model.cc',
@@ -1258,6 +1260,8 @@
       'browser/sync/glue/synced_tab_delegate.cc',
       'browser/sync/sync_ui_util.cc',
       'browser/sync/sync_ui_util.h',
+      'browser/webusb_detector_factory.cc',
+      'browser/webusb_detector_factory.h',
     ],
     'chrome_browser_win_sources': [
       'browser/browser_process_platform_part_aurawin.cc',
@@ -3632,6 +3636,7 @@
           'sources': [ '<@(chrome_browser_non_mobile_sources)' ],
           'dependencies': [
             '../components/components.gyp:feedback_component',
+            '../components/components.gyp:webusb',
             '../device/core/core.gyp:device_core',
             '../device/devices_app/devices_app.gyp:devices_app_public_cpp',
             '../device/devices_app/devices_app.gyp:devices_app_public_cpp_factory',