CHROMIUM: Merge remote-tracking branch 'upstream/master' into HEAD

Pull in latest upstream to pick up a workaround for dead-cells, glbench
fix, async shader compile for faster first-time game startup (shader
cache miss case), etc

BUG=b:180435689, b:179122157
TEST=dead-cells, asphalt9, gfxbench, various webgl, etc

Change-Id: I2c048f41f886980b1c2d3cd066f3e21d9e66e807