Hook up shader long variable name mapping with GPU command buffer port.

Hook up shader long variable name mapping with GPU command buffer port.

shader long variable name mapping is implemented in Angle shader translator.  We should hook up the feature with GPU command buffer so long names won't cause shader compile/link failure or crashes.

BUG=84753
TEST=tree green, webgl's conformance/glsl-conformance.html and conformance/glsl-long-variable-names pass on all platforms (Mac/Win/Linux), gles2 conformance test suites run ok.
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=87899

[Zhenyao Mo, 2011-06-03 21:56:24]

Please review.  Thanks.

[greggman, 2011-06-03 22:46:24]

lgtm