Fix a few minor issues.
Fix a few minor issues.

1 is that Client objects are added to the 
global list of clients before they are ready.

I just added a check that they are ready with
if (this.gl) although we could change the code
so they don't get added in the constructor
but instead in initWithCanvas.

Also added "webgl" as a context name.


TEST=none
BUG=none

Review URL: http://codereview.chromium.org/3164044

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@57613 0039d316-1c4b-4281-b951-d872f2087c98

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