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ANGLE's shader translators hold a significant amount of memory for the
builtin symbols.  By lazily creating the shader translator, it may never
be intialized at all if all compiles hit the program binary cache.

BUG=695135

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Change-Id: I095dd2efa33e111726db893cd14c3c3574bdd6ce
Reviewed-on: https://chromium-review.googlesource.com/570540Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488317}