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Some EGL drivers do not support binding one component textures to an
EGL image. One component textures are used for YUV video frames, so
to support those drivers in WebView, we need to do YUV to RGB
conversion in software, and then upload an RGB texture instead of a
set of 3 Y,U,V textures.

BUG=579060, 632461
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2242453002
Cr-Commit-Position: refs/heads/master@{#418819}