gdata: Save screenshot to /drive.

gdata: Save screenshot to /drive.

Note that this does not support the full functions of screenshots.
It merely makes possible to save the screenshot .png file to  /drive.
What are *not* yet included in this patch are:
- Show/upload the images from "Report issue" (crbug:140622).
- Taking care of name collisions. For now, when a screenshot is taken
  after a short time period of another screenshot, the new comer will
  overwrite or recorded as ".. (1).png", depending on timing.

Not quite good, but for M22, I hope it is better than nothing.

BUG=138593
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=150204

[kinaba, 2012-08-06 04:55:55]

Mukai-san, can you take a look?
(I'll soon file a bug for a name collision case).

[Jun Mukai, 2012-08-06 05:12:51]

lgtm

can you file an issue in case of multi-display and gdata screenshot?

[kinaba, 2012-08-06 08:13:25]

> can you file an issue in case of multi-display and gdata screenshot?
Filed a bug and added it in the comment.

Ben, could you please take a look on this CL as an owner?
I'd like to land it for M22 if possible.

[Ben Goodger (Google), 2012-08-06 19:37:04]

lgtm

[commit-bot: I haz the power, 2012-08-06 23:40:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/kinaba@chromium.org/10830179/7002

[commit-bot: I haz the power, 2012-08-07 01:08:09]

Change committed as 150204