The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8

commit dc5d9051abbe865c3d97f75f6e64c0f04a7492a8
Author: reillyg <reillyg@chromium.org>
Date: Tue Oct 04 10:43:31 2016

Add PermissionDescriptor to the permissions Mojo interface.

A permission descriptor is a structure describing a permission that an
origin may request. Most permissions are only identified by their names
but some have additional parameters. For example, a Bluetooth device
permission may include the MAC address of the device (or other unique
identifier) so that the permission applies to only the device selected
by the user through some sort of chooser interface.

BUG=638721

Review-Url: https://codereview.chromium.org/2255933002
Cr-Commit-Position: refs/heads/master@{#422744}

[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/content/browser/permissions/permission_service_impl.cc
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/content/browser/permissions/permission_service_impl.h
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/content/renderer/media/media_permission_dispatcher.cc
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/LayoutTests/fast/dom/Geolocation/resources/geolocation-mock.js
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/geolocation/DEPS
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/geolocation/Geolocation.cpp
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/notifications/NotificationManager.cpp
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/permissions/BUILD.gn
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/permissions/PermissionStatus.cpp
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/permissions/PermissionStatus.h
[add] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/permissions/PermissionUtils.cpp
[add] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/permissions/PermissionUtils.h
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/permissions/Permissions.cpp
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/permissions/Permissions.h
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/quota/StorageManager.cpp
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/webmidi/DEPS
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/webmidi/MIDIAccessInitializer.cpp
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/Source/modules/webmidi/MIDIAccessInitializer.h
[modify] https://crrev.com/dc5d9051abbe865c3d97f75f6e64c0f04a7492a8/third_party/WebKit/public/platform/modules/permissions/permission.mojom

I was looking on making a web app that connects to multiple bluetooth heart rate monitors. Currently it is not possible to make it connect automatically (am I wrong?). With the function specified here: https://webbluetoothcg.github.io/web-bluetooth/#bluetoothdevice it should be possible but it is not yet implemented in chrome. I would like to know if it will be available any time soon.