Fixup android launch script

platform_tools/android/bin/android_launch_app

Index: platform_tools/android/bin/android_launch_app
diff --git a/platform_tools/android/bin/android_launch_app b/platform_tools/android/bin/android_launch_app
index d31e5cb35048458b27834a7d96b061349bb03501..53b00e902312e6a5ccfbb7c2829fb76d8c81d855 100755
--- a/platform_tools/android/bin/android_launch_app
+++ b/platform_tools/android/bin/android_launch_app
@@ -12,5 +12,17 @@ if [[ -n $RESOURCE_PATH ]]; then
   adb_push_if_needed "${SKIA_SRC_DIR}/resources" $RESOURCE_PATH
 fi
 
-$ADB ${DEVICE_SERIAL} shell am start -S -n "com.skia/.SkiaSampleActivity" --es "cmdLineFlags" "${APP_ARGS[*]}"
+app=${APP_ARGS[0]}
+if [[ ${app} == '-'* ]]; then
+    app="SampleApp"
+    APP_ARGS=( "SampleApp" ${APP_ARGS[*]} )
+fi
+
+if [[ ${app} == 'SampleApp' ]]; then
+    $ADB ${DEVICE_SERIAL} shell am start -S -n "com.skia/.SkiaSampleActivity" --es "cmdLineFlags" "${APP_ARGS[*]:1}"
+elif [[ ${app} == "VisualBench" ]] ; then
+    $ADB ${DEVICE_SERIAL} shell am start -S -n "com.skia/.VisualBenchActivity" --es "cmdLineFlags" "${APP_ARGS[*]:1}"
+else
+    echo "ERROR: supports either 'SampleApp' or 'VisualBench' as valid apps"
+fi