Pass shift-ctrl-L to browser so screen-lock combo works on CrOS.

BUG=chromium:233008
TEST=hterm_test.html, 66/66 tests passed
TEST=manual

Change-Id: I3fefe3a383cf48bf26becf7bdaafe8784f64063b
Reviewed-on: https://gerrit.chromium.org/gerrit/48553
Reviewed-by: Robert Ginda <rginda@chromium.org>
Commit-Queue: Marius Schilder <mschilder@chromium.org>
Tested-by: Marius Schilder <mschilder@chromium.org>
2 files changed
tree: 4d020ad4b3432d2a77f0507fe57076919d158b74
  1. crosh_builtin/
  2. hterm/
  3. libdot/
  4. nassh/