Have a central operation status code for ServiceWorker

Have a central operation status code for ServiceWorker

Could we have something like it?

We'll still need some if/switch code in each module to filter out
irrelevant status code, but having a central status code usually
makes things easier:
- less switch/case between small module boundaries
- single StatusCodeToString method for error reporting and debugging

BUG=285976
R=alecflett@chromium.org
TBR=jam

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=246832

[kinuko, 2014-01-20 10:33:42]

While I've been working on StartWorker patch I felt it might be easier for us to
have a central, module-global operation status code for ServiceWorker. 
Otherwise we'll need to have numbers of switch/case code whenever we want to
propagate error code across sub-modules (like SWRegistrationJob and SWVersion as
in your patch).  Wdyt?

[alecflett, 2014-01-23 18:04:11]

lgtm

sounds like a great simplification

[commit-bot: I haz the power, 2014-01-23 18:04:18]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/kinuko@chromium.org/142973003/1

[commit-bot: I haz the power, 2014-01-23 18:28:55]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[kinuko, 2014-01-24 04:53:37]

Fixed build error, also TBR=jam for file addition in content/content_common.gypi

[commit-bot: I haz the power, 2014-01-24 04:58:21]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/kinuko@chromium.org/142973003/230001

[commit-bot: I haz the power, 2014-01-24 07:41:00]

Retried try job too often on win_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2014-01-24 07:57:58]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/kinuko@chromium.org/142973003/230001

[kinuko, 2014-01-24 10:25:35]

Committed patchset #2 manually as r246832 (presubmit successful).