Chrome 'protocol handlers' extracted from Google Chrome browser source code (chromium-50.0.2624.0.tar.xz downloaded from https://gsdview.appspot.com/chromium-browser-official/). A lot will not work, some are probably from unit tests.

chrome-uri.txt

chrome://-alkuisissa
chrome://-nettadresser
chrome://-webbadresser
chrome://ChromeTestChromeWebUIControllerFactory
chrome://DummyURL
chrome://URLs
chrome://about
chrome://accessibility
chrome://anything
chrome://app-list
chrome://appcache-internals
chrome://apps
chrome://badala
chrome://badcastcrash
chrome://bar
chrome://blah
chrome://blank
chrome://blob-internals
chrome://bluetooth-pairing
chrome://bogus
chrome://bookmarks
chrome://browser
chrome://certificate-manager
chrome://choose-mobile-network
chrome://chrome
chrome://chrome-signin
chrome://chrome-urls
chrome://components
chrome://conflicts
chrome://constrained-test
chrome://consumer-management
chrome://contextual-search-promo
chrome://cookieset
chrome://copresence
chrome://crash
chrome://crashdump
chrome://crashes
chrome://credits
chrome://credits-
chrome://cryptohome
chrome://device-emulator
chrome://device-log
chrome://devices
chrome://discards
chrome://dns
chrome://dom-distiller
chrome://domain-reliability-internals
chrome://downloads
chrome://drive
chrome://drive-internals
chrome://example
chrome://extension
chrome://extension-crash
chrome://extension-icon
chrome://extensions
chrome://extensions-frame
chrome://extensions-kohdassa
chrome://external-file
chrome://f
chrome://fallback-icon
chrome://favicon
chrome://fblahblahblah
chrome://fg
chrome://fileicon
chrome://first-run
chrome://fl
chrome://flag
chrome://flagg
chrome://flags
chrome://flash
chrome://foo
chrome://gcm-internals
chrome://gesture
chrome://gpu
chrome://gpuclean
chrome://gpucrash
chrome://gpuhang
chrome://hang
chrome://help
chrome://help-frame
chrome://histograms
chrome://historik
chrome://history
chrome://history-frame
chrome://host
chrome://http
chrome://identity-internals
chrome://imageburner
chrome://indexeddb-internals
chrome://inducebrowsercrashforrealz
chrome://inspect
chrome://instant
chrome://internal
chrome://interstitials
chrome://invalidations
chrome://javascript
chrome://kasko
chrome://keyboard
chrome://keyboardoverlay
chrome://kill
chrome://large-icon
chrome://linux-proxy-config
chrome://local-state
chrome://make-metro
chrome://managed-user-passphrase
chrome://md-policy
chrome://md-settings
chrome://measurepageloadtimeextension
chrome://media-internals
chrome://media-router
chrome://memory
chrome://memory-internals
chrome://memory-redirect
chrome://mobilesetup
chrome://mojo-web-ui
chrome://most_visited
chrome://nacl
chrome://navigate
chrome://net
chrome://net-export
chrome://net-internals
chrome://network
chrome://network-error
chrome://network-errors
chrome://newprofile
chrome://newtab
chrome://newtab2
chrome://newtab3
chrome://nfc-debug
chrome://omaha
chrome://omnibox
chrome://oobe
chrome://options
chrome://os-credits
chrome://os_credits
chrome://password-manager-internals
chrome://path
chrome://peripheral-battery
chrome://plugins
chrome://pnacl-translator
chrome://policy
chrome://popular-sites-internals
chrome://power
chrome://ppapiflashcrash
chrome://ppapiflashhang
chrome://predictors
chrome://preferences
chrome://print
chrome://profile-signin-confirmation
chrome://profiler
chrome://proximity-auth
chrome://proximity_auth
chrome://proxy-settings
chrome://quit
chrome://quit-with-apps
chrome://quota-internals
chrome://recent-tabs
chrome://resources
chrome://restart
chrome://s
chrome://salsa
chrome://sandbox
chrome://screen
chrome://screenlock-icon
chrome://screenshot
chrome://serviceworker-internals
chrome://session
chrome://set-time
chrome://settings
chrome://settings-frame
chrome://setupfortesting
chrome://shorthang
chrome://sign-in
chrome://signin
chrome://signin-internals
chrome://sim-unlock
chrome://site-engagement
chrome://slow
chrome://slow_trace
chrome://somepage
chrome://source_name
chrome://stylesheet
chrome://suggestions
chrome://supervised-user-internals
chrome://sync-internals
chrome://syncfs-internals
chrome://syncresources
chrome://system
chrome://tab-modal-confirm-dialog
chrome://tcmalloc
chrome://terms
chrome://test
chrome://test-page
chrome://theme
chrome://thumb
chrome://thumbnail
chrome://thumbnails
chrome://thumbs
chrome://tracing
chrome://trailing2blah
chrome://translate-internals
chrome://uber-frame
chrome://ui-alternatives
chrome://uithreadhang
chrome://user
chrome://user-actions
chrome://user-chooser
chrome://user-manager
chrome://userimage
chrome://usr
chrome://ve
chrome://version
chrome://view-cert
chrome://view-cert-dialog
chrome://view-http-cache
chrome://voicesearch
chrome://webrtc-device-provider
chrome://webrtc-internals
chrome://webrtc-logs
chrome://webui
chrome://welcome
chrome://youtube

Well, I, for one, am confident that chrome://bogus will DEFINITELY work.