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VideoLayerImpl is appending StreamVideoDrawQuads on CrOS.

StreamVideoDrawQuads should be used on Android since almost all its
features are supported by TextureDrawQuad.
The only difference is that StreamVideoDrawQuad calls
glUniformMatrix4fvStreamTextureMatrixCHROMIUM before drawing, that
just sets a uniform matrix on CrOS.

This CL makes sure VideoLayerImpl produces StreamVideoDrawQuads only
on Android.

BUG=702750
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2763223003
Cr-Commit-Position: refs/heads/master@{#460547}