Add support for drive files to chrome.fileBrowserHandler.selectFile

Add support for drive files to chrome.fileBrowserHandler.selectFile

first, we don't create file on disk when it is selected anymore (since we can't really know exact file path for drive files), we just setup permissions for the file.

second, we have to give read permissions for drive cache paths as well in order to enable file reading. 

TEST=existing
BUG=138089
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=148292

[tbarzic, 2012-07-18 16:22:31]

hshi, can you take a look at this (afaik, you're familiar enough with setting
file access perms for drive cache file paths)

Aaron for the owner review of common/extensions. Do you have any concerns about
this?

[tbarzic, 2012-07-18 23:12:37]

just realized hshi is out this week..
satorux, could you take a look at this?

[satorux1, 2012-07-19 16:17:03]

Could you file a bug about the problem you are solving?

[tbarzic, 2012-07-19 16:27:39]

On 2012/07/19 16:17:03, satorux1 wrote:
> Could you file a bug about the problem you are solving?

done

[satorux1, 2012-07-19 16:44:54]

LGTM

[tbarzic, 2012-07-24 17:12:28]

Aaron: ping?

[Aaron Boodman, 2012-07-24 21:36:40]

LGTM

Did you double-check that nobody is relying on the fact that files get created
by this dialog?

[tbarzic, 2012-07-25 00:45:16]

On 2012/07/24 21:36:40, Aaron Boodman wrote:
> LGTM
> 
> Did you double-check that nobody is relying on the fact that files get created
> by this dialog?

yeah.. afaik, only quickoffice actually uses this function, and this change
shouldn't break them

[commit-bot: I haz the power, 2012-07-25 02:49:59]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tbarzic@chromium.org/10664002/23001

[commit-bot: I haz the power, 2012-07-25 04:48:32]

Change committed as 148292