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The SwiftShader library was failing to load properly when used as a WebGL
fallback because of a sandboxing issue. This cl works around that issue
by changing where the SwiftShader initializatin is done.

Credit to zmo@ for this fix, which I cherry picked from:
https://chromium-review.googlesource.com/c/chromium/src/+/1005017/20..21

Fixes:
gpu_tests.gpu_process_integration_test.GpuProcessIntegrationTest.GpuProcess_feature_status_under_swiftshader

Bug: chromium:726075
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I56a00cef70cb630bbf6d5fe7f342a8d5b1c2211d
Reviewed-on: https://chromium-review.googlesource.com/1042496
Commit-Queue: Alexis Hétu <sugoi@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556163}