Revert 92429 - Detect and expose loss of OpenGL context using GL_ARB_robustness. (Regressed static initalizer size on Linux -- will need to reexamine code to understand why.)

This initial patch changes the Linux port to use
GLX_ARB_create_context_robustness when available, and tests
periodically whether the context has been lost after each draw call
and when making the context current. The detection of context loss
also works with EGL and ANGLE, although it always reports an unknown
reset status.

WebKit changes will follow which test the reset status and determine
what to do in response; for example, the policy might be to never
restore a WebGL context which was lost (due to a GPU reset) and which
was determined to be the guilty context.

Tested manually with WebGL stress tests and verified on Linux and
Windows that in at least some situations it is possible to detect
guilty contexts and shut down the associated WebGL application. Some
precision of this detection was recently lost and will need to be
fixed in following CLs. Also updated and ran GPU unit tests.

BUG=88106
TEST=none (tested manually; try servers)
Review URL: http://codereview.chromium.org/7331020

TBR=kbr@chromium.org
Review URL: http://codereview.chromium.org/7346032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@92434 0039d316-1c4b-4281-b951-d872f2087c98

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