Add perf tests for PendingIntent

Test: m CorePerfTests
Test: adbi "$OUT"/data/app/CorePerfTests/CorePerfTests.apk
Test: adb shell am instrument -w -e class \
android.app.PendingIntentPerfTest \
com.android.perftests.core/android.support.test.runner.AndroidJUnitRunner

BUG: 67460485

Change-Id: I45bfc694454b466041d81e37a9010d58c170a4d3