Add permission check to FakeDriveService

Add permission check to FakeDriveService

Add a new method SetUserPermission() to set the user's permission for a file.
Check the permission in DeleteResource(), TrashResource(), UpdateResource() and InitiateUploadExistingFile().

This change doesn't cover:
- Permission check for the parent when adding/removing entries to a directory.
- Cases where the permission is changed while upload is in progress. (even not sure what happens in the production)

BUG=340933
TEST=unit_tests --gtest_filter="FakeDriveServiceTest.*"

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=288062

[kinaba, 2014-08-07 08:41:01]

lgtm

[hashimoto, 2014-08-07 10:16:18]

The CQ bit was checked by hashimoto@chromium.org

[commit-bot: I haz the power, 2014-08-07 10:17:32]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hashimoto@chromium.org/445793003/40001

[commit-bot: I haz the power, 2014-08-07 10:21:31]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_aosp on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_aosp/bu...)
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)
  linux_chromium_chromeos_rel_swarming on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  ios_rel_device_ninja on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  mac_chromium_rel_swarming on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)
  win8_chromium_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_rel...)

[commit-bot: I haz the power, 2014-08-07 10:23:09]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-07 10:23:10]

Try jobs failed on following builders:
  ios_rel_device_ninja on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  mac_chromium_rel_swarming on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[hashimoto, 2014-08-07 10:26:43]

The CQ bit was checked by hashimoto@chromium.org

[commit-bot: I haz the power, 2014-08-07 10:28:06]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hashimoto@chromium.org/445793003/60001

[commit-bot: I haz the power, 2014-08-07 13:25:53]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_gn_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[commit-bot: I haz the power, 2014-08-07 16:03:47]

Change committed as 288062