Update SECCOMP policy for Tegra 124 sandbox

Add whitelist for T124 files and preload libraries

BUG=none
TEST=Booted to browser successfully, about:gpu shows sandboxed to true.

Review URL: https://codereview.chromium.org/135263002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247419 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247419
Add a11y on-screen keyboard.

Adds an accessibility option for displaying a virtual keyboard on the login screen and on the settings page.

Followup patches required to persist the login preference on first time sign in, and to use the full virtual keyboard in place of the touch optimized version. 

BUG=297132

Review URL: https://codereview.chromium.org/137543002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247420 0039d316-1c4b-4281-b951-d872f2087c98
Preparation for changing mount path for Drive folder to profile-wise different one.

- drive::util::GetDriveMountPointPath now takes Profile* as a parameter.

- I haven't change the return value of the function yet.
 I'll do it separately once all the dependencies are cleared.

- drive::util::{ExtractDrivePath,IsUnderDriveMountPoint} just ignores the profile part, since:
-- From some uses of these functions Profile* is not available hence its' tedious to wire.
-- At least in the latest design of multi-profiles (each profile's folder only appears in
 its own profile's Files.app; copy-and-paste between Files.apps are the only point that
 multiple profiles interacts), almost all of the uses of them takes only current profiles
 /special/drive path. Hence, it's safe to ignore the part.
-- Only one exceptional use is in FileSystem API layer, that anyway needs more sophistication
 and will be separately treated.
---- If the above design were changed again and we need to differentiate multiple profiles in
 every callsites, passing current profile to the functions does not solve any issue after all
 because it cannot deal with multiple profiles.

BUG=336123
TBR=benwells

Review URL: https://codereview.chromium.org/141143009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247421 0039d316-1c4b-4281-b951-d872f2087c98
Android: Always update SurfaceTexture

The conditional added in r247382 does not work without virtual
contexts, because the owner stub is actually the renderer's shared
main thread context.

TBR=skyostil@chromium.org
NOTRY=True

Review URL: https://codereview.chromium.org/141433023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247422 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247422