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Now MessagePumpFuchsia runs AsyncDispatcher to handle IO events. This will
allow to use async lib and libraries that depend on it (such as FIDL) on
UI and IO threads.

Bug: 831384
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I981d18f9e07d25a5cd4f6006714af91557c0c795
Reviewed-on: https://chromium-review.googlesource.com/985648
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551399}