de-flake test on Android devices (#666)

Author: sunmou99

scripts/gha/print_matrix_configuration.py

@@ -161,7 +161,7 @@
 
 TEST_DEVICES = {
   "android_min": {"type": "real", "model":"Nexus10", "version":"19"},
-  "android_target": {"type": "real", "model":"Pixel2", "version":"28"},
+  "android_target": {"type": "real", "model":"blueline", "version":"28"},
   "android_latest": {"type": "real", "model":"flame", "version":"29"},
   "emulator_min": {"type": "virtual", "image":"system-images;android-18;google_apis;x86"},
   "emulator_target": {"type": "virtual", "image":"system-images;android-28;google_apis;x86_64"},

scripts/gha/test_simulator.py

@@ -549,8 +549,8 @@ def _create_and_boot_emulator(sdk_id):
   logging.info("Wait for emulator to boot: %s", " ".join(args))
   subprocess.run(args=args, check=True)
   if FLAGS.ci: 
-    # wait extra 90 seconds to ensure emulator booted.
-    time.sleep(90)
+    # wait extra 90 seconds to ensure emulator fully booted.
+    time.sleep(180)
   else:
     time.sleep(45)