Avoid unnecessary libevent timers in the MessagePump #1387

Job	Run time
android-x86 / initialize	47s
android-arm / initialize	1m 6s
android-arm64 / initialize	45s
android-arm64 / docker-build-image	2m 9s
android-arm64 / docker-unittest-image	0s
android-x86 / docker-build-image	2m 1s
android-x86 / docker-unittest-image	0s
android-arm / docker-build-image	2m 3s
android-arm / docker-unittest-image	0s
android-x86 / x86_devel	17m 15s
android-x86 / x86_debug	16m 58s
android-x86 / x86_qa	9m 52s
android-x86 / x86_gold	10m 47s
android-arm64 / arm64_devel	20m 49s
android-arm64 / arm64_debug	12m 18s
android-arm64 / arm64_qa	11m 46s
android-arm64 / arm64_gold	10m 25s
android-arm / arm_devel	20m 26s
android-arm / arm_debug	16m 55s
android-arm / arm_qa	10m 57s
android-arm / arm_gold	10m 23s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / arm_on_device_0	8m 18s
android-arm / arm_on_device_1	8m 18s
android-arm / arm_on_device_2	8m 18s
android-arm / arm_on_device_3	8m 18s
android-arm / arm_on_device_black_box_test	8m 19s
upload-release-artifacts	0s
	3h 39m 13s

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