Add performance test for suggestConversationActions and detectLanguage

This is the framework used by other system component like autofill.
We will use this to answer system health question.

We can also monitor the metric in this dashboard once it is submitted.
https://blackbox.googleplex.com/#/custom/fw_other

Result in pixel2 eng build (unit: nano second)
(We will have more accurate result in the dashboard, we are advised not to run perf test
in eng build)
android.textclassifier.TextClassifierPerfTest:INSTRUMENTATION_STATUS: detectLanguage[size=0]_mean=15010771
INSTRUMENTATION_STATUS: detectLanguage[size=0]_median=15203514
INSTRUMENTATION_STATUS: detectLanguage[size=0]_min=10497747
INSTRUMENTATION_STATUS: detectLanguage[size=0]_standardDeviation=3061947
INSTRUMENTATION_STATUS_CODE: -1
.INSTRUMENTATION_STATUS: suggestConversationActions[size=0]_mean=39863316
INSTRUMENTATION_STATUS: suggestConversationActions[size=0]_median=41535711
INSTRUMENTATION_STATUS: suggestConversationActions[size=0]_min=35979326
INSTRUMENTATION_STATUS: suggestConversationActions[size=0]_standardDeviation=3297779
INSTRUMENTATION_STATUS_CODE: -1
.INSTRUMENTATION_STATUS: detectLanguage[size=10]_mean=14711781
INSTRUMENTATION_STATUS: detectLanguage[size=10]_median=13608035
INSTRUMENTATION_STATUS: detectLanguage[size=10]_min=12184472
INSTRUMENTATION_STATUS: detectLanguage[size=10]_standardDeviation=3144018
INSTRUMENTATION_STATUS_CODE: -1
.INSTRUMENTATION_STATUS: suggestConversationActions[size=10]_mean=43076381
INSTRUMENTATION_STATUS: suggestConversationActions[size=10]_median=43618067
INSTRUMENTATION_STATUS: suggestConversationActions[size=10]_min=38747603
INSTRUMENTATION_STATUS: suggestConversationActions[size=10]_standardDeviation=3502977
INSTRUMENTATION_STATUS_CODE: -1
.INSTRUMENTATION_STATUS: detectLanguage[size=100]_mean=20646733
INSTRUMENTATION_STATUS: detectLanguage[size=100]_median=20766674
INSTRUMENTATION_STATUS: detectLanguage[size=100]_min=19184218
INSTRUMENTATION_STATUS: detectLanguage[size=100]_standardDeviation=892559
INSTRUMENTATION_STATUS_CODE: -1
.INSTRUMENTATION_STATUS: suggestConversationActions[size=100]_mean=42126088
INSTRUMENTATION_STATUS: suggestConversationActions[size=100]_median=43709436
INSTRUMENTATION_STATUS: suggestConversationActions[size=100]_min=36636031
INSTRUMENTATION_STATUS: suggestConversationActions[size=100]_standardDeviation=4863678
INSTRUMENTATION_STATUS_CODE: -1
.INSTRUMENTATION_STATUS: detectLanguage[size=1,000]_mean=21721753
INSTRUMENTATION_STATUS: detectLanguage[size=1,000]_median=22690096
INSTRUMENTATION_STATUS: detectLanguage[size=1,000]_min=16252464
INSTRUMENTATION_STATUS: detectLanguage[size=1,000]_standardDeviation=3445673
INSTRUMENTATION_STATUS_CODE: -1
.INSTRUMENTATION_STATUS: suggestConversationActions[size=1,000]_mean=45968389
INSTRUMENTATION_STATUS: suggestConversationActions[size=1,000]_median=47465009
INSTRUMENTATION_STATUS: suggestConversationActions[size=1,000]_min=39389483
INSTRUMENTATION_STATUS: suggestConversationActions[size=1,000]_standardDeviation=3820288
INSTRUMENTATION_STATUS_CODE: -1

Test: Run commands below
mmma -j ./frameworks/base/apct-tests/perftests/core/;
adb install -r $OUT/data/app/CorePerfTests/CorePerfTests.apk;
adb shell am instrument -w -e class android.textclassifier.TextClassifierPerfTest com.android.perftests.core/android.support.test.runner.AndroidJUnitRunner
adb shell cmd package compile -m speed -f com.android.perftests.core;

Change-Id: Ia2c746f48ed018269a230422a695caca05844a12