Add GetAboutResource to DriveServiceInterface.

Add GetAboutResource to DriveServiceInterface.

Drive API v2 has two APIs to retrieve meta data:
1) "GetAboutResourceOperation" for quota, changestamp and root id.
2) "GetApplistOperation" for a list of installed apps.
On the other hand, GDataWAPI has one API to retrieve them (except root id) at once, which is "GetAccountMeatadataOperation".
It is possible to split the call of GetAccountMetadata into two (for about resource and for app list each). So, to fill the gap, GetAccountMetadata will be migrated into GetAboutResource and GetAppList.
This CL just adds the method to the interface and some stub implementation only. The real implementation for each inheriting class and the client migration will be done in following CLs.

BUG=174237
TEST=Ran unit_tests.


Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=184711

[hidehiko, 2013-02-26 08:42:19]

Thank you for your review in advance,
- hidehiko

[kinaba, 2013-02-26 09:18:04]

LGTM, but could you add some more specifics in the CL description?
(By explaining that in Drive API getting account info [GetAboutResource]
and application list [GetAppList] have to be separate API calls,
and in WAPI they were combined [GetAccountMetadata] but can also be
split into two calls without problems, so you're aligning to split).

[hashimoto, 2013-02-26 09:24:21]

lgtm

https://codereview.chromium.org/12342008/diff/1/chrome/browser/google_apis/dr...
File chrome/browser/google_apis/drive_service_interface.h (right):

https://codereview.chromium.org/12342008/diff/1/chrome/browser/google_apis/dr...
chrome/browser/google_apis/drive_service_interface.h:22: class
AccountMetadataFeed;
nit: Please sort these while you are here.

[hidehiko, 2013-02-26 09:44:50]

Thank you for your review.
Updated the CL description.

Submitting consecutively...

https://codereview.chromium.org/12342008/diff/1/chrome/browser/google_apis/dr...
File chrome/browser/google_apis/drive_service_interface.h (right):

https://codereview.chromium.org/12342008/diff/1/chrome/browser/google_apis/dr...
chrome/browser/google_apis/drive_service_interface.h:22: class
AccountMetadataFeed;
On 2013/02/26 09:24:21, hashimoto wrote:
> nit: Please sort these while you are here.

Done.

[commit-bot: I haz the power, 2013-02-26 13:53:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hidehiko@chromium.org/12342008/11001

[commit-bot: I haz the power, 2013-02-26 19:56:20]

Change committed as 184711