AndroidNetwork plugin: ensure battery_stats metric is run before refe…

…rencing its output

For users that disable the "run metric on load" UI flags, the network
plugin results in an error. The UI is fine after dismissing the error
dialog, but let's get rid of the dialog at the cost of running the
metric anyway.

Imo this is a stopgap, we shouldn't even run plugins on traces that
don't contain the relevant events (such as running android plugins on
desktop linux traces).

Bug: 322498817
Change-Id: Ic91750f92bfc0d4623c630c6f16a9f5a8e49abd1

ui/src/plugins/dev.perfetto.AndroidLongBatteryTracing/index.ts

@@ -215,8 +215,6 @@ const MODEM_RIL_STRENGTH = `
   USING SPAN_JOIN(RilSignalStrength PARTITIONED track_id, ScreenOn)`;
 
 const MODEM_RIL_CHANNELS_PREAMBLE = `
-  SELECT IMPORT('android.battery_stats');
-
   CREATE OR REPLACE PERFETTO FUNCTION EXTRACT_KEY_VALUE(source STRING, key_name STRING) RETURNS STRING AS
   SELECT SUBSTR(trimmed, INSTR(trimmed, "=")+1, INSTR(trimmed, ",") - INSTR(trimmed, "=") - 1)
   FROM (SELECT SUBSTR($source, INSTR($source, $key_name)) AS trimmed);`;
@@ -943,6 +941,7 @@ class AndroidLongBatteryTracing implements Plugin {
             WHERE track_name = "${track}"`,
         groupId);
 
+    await e.query(`SELECT IMPORT('android.battery_stats');`);
     return flatten([
       query('Top App', 'battery_stats.top'),
       this.addSliceTrack(