Need to pass this flag to GPU process...
Need to pass this flag to GPU process...

so that it loads libllvmpipe.so on Aura GpuPixelBrowserTests as well.

BUG=113624
TEST=put libllvmpipe.so in your library path; run an aura build of chrome with "./chrome --test-gl-lib=libllvmpipe.so  http://www.webkit.org/blog-files/3d-transforms/poster-circle.html"; see process usage spike


Review URL: http://codereview.chromium.org/9384003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@121516 0039d316-1c4b-4281-b951-d872f2087c98

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