Add --gpu-no-context-lost commandline switch.

Add --gpu-no-context-lost commandline switch.

At the moment chrome users with GLES backend do not have accelerated 2d canvas if a graphics context could be lost.  Unfortunately we don't have a way to know if a GLES backend does or does not lose context in situations like entering power saving mode, screen saving mode, etc.  This switch basically tells chrome the backend does not lose context, thus, enable accelerated 2d canvas.

BUG=90464
TEST=bots green, passing this switch with GLES backend enables accelerated 2d canvas
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=94548

[Zhenyao Mo, 2011-07-28 20:35:02]

Please review.

[apatrick_chromium, 2011-07-28 20:58:47]

LGTM