Add extractor for battery counters.

Test: tools/diff_test_trace_processor.py --test-type metrics out/android/trace_processor_shell

Change-Id: I1f56c160ffc6535dc06957954e9f8e56a284ff0c
diff --git a/protos/BUILD b/protos/BUILD
index 1adcb01..0fb828a 100644
--- a/protos/BUILD
+++ b/protos/BUILD
@@ -227,6 +227,7 @@
 proto_library(
     name = "metrics_android",
     srcs = [
+        "perfetto/metrics/android/batt_metric.proto",
         "perfetto/metrics/android/heap_profile.proto",
         "perfetto/metrics/android/mem_metric.proto",
         "perfetto/metrics/android/startup_metric.proto",
@@ -265,6 +266,7 @@
 proto_library(
     name = "metrics_android_zero",
     srcs = [
+        "perfetto/metrics/android/batt_metric.proto",
         "perfetto/metrics/android/heap_profile.proto",
         "perfetto/metrics/android/mem_metric.proto",
         "perfetto/metrics/android/startup_metric.proto",