Implement Resource class

[sethladd]

The Resource class has landed in the SDK. Implementation should be underway, and it doesn't need to be behind any sort of flag.

This is the main tracking issue. Individual issues are below:

• Resource class API in SDK (https://codereview.chromium.org/1181663002/)
• VM VM: Implementing Resource class #23824
• VM tests Add VM tests for the Resource API #23987
• dart2js dart2js: Implementing Resource class #23825
• sufficient api docs
• .packages file is written during pub global activate (write a .packages when globally installing a package pub#22; merge request is Merge the latest pub to dev #24094)
  (this is required to resolve a package: URI via the resource class from a globally activated package)
• Mark class as experimental Mark Resource class 'Experimental' in 1.12 #24150

(original feature request: #21020)

[mit-mit]

@sethladd, would you mind updating this issue with the latest status (what remains for 1.12, and roughly when do we think that will be completed)?

[sethladd]

Hi @mit-mit . The issue's checklist is up to date. We might need a new title, though, because this was originally about the initial/minimal Resource class, but looks like it's grown to a list of many tasks around resources, in the general case.

[zoechi]

dart-lang/pub#22 is already fixed

[sethladd]

@zoechi it's not actually shipping in the SDK yet. I don't want to check it off until 1.12-dev-something has it.

[zoechi]

Thanks for the info. Makes sense.

[mit-mit]

Meta bug, assigning to self to drive to completion for 1.12.

[mit-mit]

Marking the merge item complete on checklist.

[mit-mit]

Added task to mark this experimental, see #24150

[mit-mit]

Marking task for experimental comment in docs complete.

[mit-mit]

Marking whole meta issue complete for 1.12: only the dart2js work remains, and that is not critical in 1.12 and will follow in 1.13.

(@sigmundch edit typo: now => not)

[sethladd]

Thanks!