Replaced cc::SurfaceId::nonce_ with base::UnguessableToken
base::SurfaceId::nonce_ is an uint64 generated at random to make the entire
surface id unguessable.
base::UnguessableToken is a wrapper for 2 uint64 (high_ and low_).
high_ and low_ are generated at random using base::UnguessableToken::Create().
base::UnguessableToken achieves the same goal as the original
cc::SurfaceId::nonce_ with better security and uses more common code.
BUG=649800
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
Review-Url: https://codereview.chromium.org/2379653006
Cr-Commit-Position: refs/heads/master@{#431294}
33 files changed
