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CommandBufferService should not accept put == num_entries, the client must
wraparound to 0 (CommandBufferHelper does).
CommandParser wraps to 0 and never sets get_ == num_entries, so
CommandParser::IsEmpty would never become true.

A test should have caught that but unfortunately it confused buffer size and
number of entries. This fixes it.

BUG=None
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2304813002
Cr-Commit-Position: refs/heads/master@{#417211}