Tradefed FilePullerLogCollector can no longer access the internal app directory (e.g. /storage/emulated/0/Android/data/com.android.server.wm.flicker/files).
This makes it unable to pull trace files, when a test fails. This CL makes flicker tests store their data on /sdcard/flicker which can be accessed by the Tradefed FilePullerLogCollector
Bug: 171026227
Test: atest WMShellFlickerTests
Change-Id: Ie2329cbc475ee1be35e6bb3e274c96a4db142ac5
Previously the flickerlib had some pixel specific code, now it's
general. All pixel specific code either should migrate to FlickerTests
or to flickerlib-helpers
Test: atest FlickerTests
Change-Id: Ibca99f2bf68a511f73130439f6334a01e47a8671
