Start target package by binding to Service, not starting Activity

This reduces the stddev for a bunch of perf tests by quite a bit
(mostly the ones that rely on starting the package).

This is because previously the target
package was made to start running by starting an Activity, which takes
up CPU cycles.

Now we start a Service and wait for it to report back that its Looper
queue is idle, then proceed.

This does seem to slightly increase the runtime for some of the tests
though...

Some test numbers (only tests that have a large difference before and
after):

Before:
registeredBroadcast_mean=1920309
registeredBroadcast_median=1724844
registeredBroadcast_stddev=559809
manifestBroadcastRunning_mean=2395693
manifestBroadcastRunning_median=2063385
manifestBroadcastRunning_stddev=809836
contentProviderRunning_mean=668463
contentProviderRunning_median=588125
contentProviderRunning_stddev=214116
bindServiceAllowOomManagement_mean=1952431
bindServiceAllowOomManagement_median=2017682
bindServiceAllowOomManagement_stddev=289311
bindServiceAlreadyBound_mean=2146257
bindServiceAlreadyBound_median=2022891
bindServiceAlreadyBound_stddev=614549
bindServiceRunning_mean=4947541
bindServiceRunning_median=4710521
bindServiceRunning_stddev=962094
startServiceProcessRunningReadUriPermission_mean=1914106
startServiceProcessRunningReadUriPermission_median=1915209
startServiceProcessRunningReadUriPermission_stddev=196136
startServiceProcessRunning_mean=2841122
startServiceProcessRunning_median=2564792
startServiceProcessRunning_stddev=684654

After:
registeredBroadcast_mean=2559587
registeredBroadcast_median=2579792
registeredBroadcast_stddev=191377
manifestBroadcastRunning_mean=2709707
manifestBroadcastRunning_median=2725365
manifestBroadcastRunning_stddev=165661
contentProviderRunning_mean=663058
contentProviderRunning_median=639062
contentProviderRunning_stddev=97864
bindServiceAllowOomManagement_mean=1899179
bindServiceAllowOomManagement_median=1932553
bindServiceAllowOomManagement_stddev=184329
bindServiceAlreadyBound_mean=2023920
bindServiceAlreadyBound_median=2051614
bindServiceAlreadyBound_stddev=159993
bindServiceRunning_mean=6683975
bindServiceRunning_median=6753699
bindServiceRunning_stddev=475811
startServiceProcessRunningReadUriPermission_mean=2388997
startServiceProcessRunningReadUriPermission_median=2405365
startServiceProcessRunningReadUriPermission_stddev=244184
startServiceProcessRunning_mean=3384101
startServiceProcessRunning_median=3388282
startServiceProcessRunning_stddev=207333

Test: m ActivityManagerPerfTestsTestApp ActivityManagerPerfTests
Test: adb install \
$OUT/data/app/ActivityManagerPerfTestsTestApp/ActivityManagerPerfTestsTestApp.apk
Test: adb install \
$OUT/data/app/ActivityManagerPerfTests/ActivityManagerPerfTests.apk
Test: adb shell am instrument -w \
com.android.frameworks.perftests.amtests/android.support.test.runner.AndroidJUnitRunner

BUG: 67460485
Change-Id: Iaaaf7d8db885cc1149e74cb7ce4b47a295ab20e4