Added command line argument --enable-webgl to facilitate turning on
ENABLE_3D_CANVAS in development builds. Currently this argument also
requires disabling the sandbox.

BUG=http://crbug.com/21852
TEST=none (runs preexisting WebGL layout tests; more coming)

Review URL: http://codereview.chromium.org/246042

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@27637 0039d316-1c4b-4281-b951-d872f2087c98
9 files changed