1/ Support nested message and repeated fields in statsd.
2/ Filter gauge fields by FieldMatcher.
3/ Wire up wakelock attribution chain.
4/ e2e test: wakelock duration metric with aggregated predicate dimensions.
5/ e2e test: count metric with multiple metric condition links for 2 predicates and 1 non-sliced predicate.

Test: statsd unit test passed.

Change-Id: I89db31cb068184a54e0a892fad710966d3127bc9
diff --git a/cmds/statsd/src/stats_log.proto b/cmds/statsd/src/stats_log.proto
index 3c85c57..f5282ea 100644
--- a/cmds/statsd/src/stats_log.proto
+++ b/cmds/statsd/src/stats_log.proto
@@ -24,8 +24,14 @@
 
 import "frameworks/base/cmds/statsd/src/atoms.proto";
 
-message KeyValuePair {
-  optional int32 key = 1;
+message Field {
+  optional int32 field = 1;
+  optional int32 position_index = 2 [default = -1];
+  repeated Field child = 3;
+}
+
+message DimensionsValue {
+  optional int32 field = 1;
 
   oneof value {
     string value_str = 2;
@@ -33,9 +39,14 @@
     int64 value_long = 4;
     bool value_bool = 5;
     float value_float = 6;
+    DimensionsValueTuple value_tuple = 7;
   }
 }
 
+message DimensionsValueTuple {
+  repeated DimensionsValue dimensions_value = 1;
+}
+
 message EventMetricData {
   optional int64 timestamp_nanos = 1;
 
@@ -51,7 +62,7 @@
 }
 
 message CountMetricData {
-  repeated KeyValuePair dimension = 1;
+  optional DimensionsValue dimension = 1;
 
   repeated CountBucketInfo bucket_info = 2;
 }
@@ -65,7 +76,7 @@
 }
 
 message DurationMetricData {
-  repeated KeyValuePair dimension = 1;
+  optional DimensionsValue dimension = 1;
 
   repeated DurationBucketInfo bucket_info = 2;
 }
@@ -79,7 +90,7 @@
 }
 
 message ValueMetricData {
-  repeated KeyValuePair dimension = 1;
+  optional DimensionsValue dimension = 1;
 
   repeated ValueBucketInfo bucket_info = 2;
 }
@@ -93,7 +104,7 @@
 }
 
 message GaugeMetricData {
-  repeated KeyValuePair dimension = 1;
+  optional DimensionsValue dimension = 1;
 
   repeated GaugeBucketInfo bucket_info = 2;
 }