LogDog: Add collector service implementation.

common/proto/logdog/svcconfig/config.pb.go

Index: common/proto/logdog/svcconfig/config.pb.go
diff --git a/common/proto/logdog/svcconfig/config.pb.go b/common/proto/logdog/svcconfig/config.pb.go
index 91882ede25293790e4c51a25add332017902ca2f..68eb0e92d384ebb7ae5441d34e7c8472a369d769 100644
--- a/common/proto/logdog/svcconfig/config.pb.go
+++ b/common/proto/logdog/svcconfig/config.pb.go
@@ -22,6 +22,7 @@ package svcconfig
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
+import google_protobuf "github.com/luci/luci-go/common/proto/google"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
@@ -95,6 +96,8 @@ type Collector struct {
 	Workers int32 `protobuf:"varint,1,opt,name=workers" json:"workers,omitempty"`
 	// The number of transport worker goroutines to run.
 	TransportWorkers int32 `protobuf:"varint,2,opt,name=transport_workers" json:"transport_workers,omitempty"`
+	// The maximum amount of time that cached stream state is valid.
+	StateCacheExpiration *google_protobuf.Duration `protobuf:"bytes,3,opt,name=state_cache_expiration" json:"state_cache_expiration,omitempty"`
 }
 
 func (m *Collector) Reset()                    { *m = Collector{} }
@@ -102,6 +105,13 @@ func (m *Collector) String() string            { return proto.CompactTextString(
 func (*Collector) ProtoMessage()               {}
 func (*Collector) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{2} }
 
+func (m *Collector) GetStateCacheExpiration() *google_protobuf.Duration {
+	if m != nil {
+		return m.StateCacheExpiration
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*Config)(nil), "svcconfig.Config")
 	proto.RegisterType((*Coordinator)(nil), "svcconfig.Coordinator")
@@ -109,21 +119,24 @@ func init() {
 }
 
 var fileDescriptor0 = []byte{
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