Add a small script to run adb logcat with filtering

We use arbitrary tags when logging stuff in our code so we can't use the
built-in filtering of adb logcat.

Change-Id: I2d607b86bde975c5cbdd17adc22d0fc15076be51

bin/lolcat

@@ -0,0 +1,19 @@
+#!/usr/bin/perl -w
+
+use strict;
+
+die "Usage: $0 identifier\n" .
+    "(identifier is for example org.libreoffice)" unless $#ARGV == 0;
+
+my $id = $ARGV[0];
+
+open (LOGCAT, "adb logcat |") || die "Could not open pipe from adb logcat";
+my $pid = '';
+
+while (<LOGCAT>) {
+  if (m!^I/ActivityManager\( *\d+\): Start proc $id for activity .*: pid=(\d+)!) {
+    $pid = $1;
+  } elsif (m!^[EIW]/[^(]+\( *$pid\)!) {
+    print $_;
+  }
+}