it is fine if FlutterWeb depends on installing linux chrome but regular Flutter on CrOS should not

@devoncarew @jacob314 I've opened a PR to simplify port selection for DevTools at #535 however I've hit a problem... In order for a (non-Web) Dart/Flutter Mobile project to work outside of the container, we need both DevTools and the VM service exposed. As far as I can tell, the VM doesn't have an option to supply multiple ports, or control its behaviour if a port is taken. That failure if already bound a) is very slow (it retries internally) and b) leaves the app paused so the process doesn't even terminate:

dantup-macbookpro:Dart Mini Sample 1 dantup$ dart --pause-isolates-on-start --observe=8123 bin/main.dart
Observatory server failed to start after 1 tries
vm-service: isolate(935791540) 'main' has no debugger attached and is paused at start.  Connect to Observatory to debug.
Observatory server failed to start after 2 tries
Observatory server failed to start after 3 tries
Observatory server failed to start after 4 tries
Observatory server failed to start after 5 tries
Observatory server failed to start after 6 tries
Observatory server failed to start after 7 tries
Observatory server failed to start after 8 tries
Observatory server failed to start after 9 tries
Observatory server failed to start after 10 tries
Observatory server failed to start after 11 tries
Could not start Observatory HTTP server:
SocketException: Failed to create server socket (OS Error: Address already in use, errno = 48), address = localhost, port = 8123
#0      _NativeSocket.bind (dart:io-patch/socket_patch.dart:591:7)
<asynchronous suspension>
#1      _RawServerSocket.bind (dart:io-patch/socket_patch.dart:1206:26)
#2      _ServerSocket.bind (dart:io-patch/socket_patch.dart:1466:29)
#3      ServerSocket.bind (dart:io-patch/socket_patch.dart:1457:26)
#4      _HttpServer.bind (dart:_http/http_impl.dart:2520:25)
#5      HttpServer.bind (dart:_http:227:19)
#6      Server.startup.poll (dart:vmservice_io/server.dart:355:36)
<asynchronous suspension>
#7      Server.startup (dart:vmservice_io/server.dart:367:23)
<asynchronous suspension>
#8      main (dart:vmservice_io:253:12)

(hang)

Pretty much same thing for Flutter, but there's a slow build in front of it, then the app launches, then you see the above.

I can't come up with a good fix for this. We could hard-code a port, detect Observatory server failed to start after 1 tries in the output, terminate the process and apologise to the user (and offer to try with the next port), but that isn't a great experience. We could pick the port randomly from the known set to reduce the chance of overlaps if the user launches multiple sessions.

P0: Add a DevTools server that can launch the Chrome browser. #463

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