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In ui/gl/init/gl_factory.cc, InitializeGLOneOffImplementation() has
functionality to fallback to software OpenGL, which wasn't working for
SwiftShader, since it uses the same initializer as Angle (which is EGL
and GLESv2). Currently, the way to distinguish between the two was
through command line flags, but the flags stay unchanged when falling
back to software OpenGL, so an extra argument was added in order to
know if the EGL/GLESv2 initialization has to use SwiftShader.

Bug: 726075
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ic4480f0e1e9ac385b90f2760408b10a9738a2498
Reviewed-on: https://chromium-review.googlesource.com/517912
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#476162}