Add snapshotting for CIPD packages and dimensions to DM.

dm/api/distributor/swarming/v1/isolate_ref.pb.go

Index: dm/api/distributor/swarming/v1/isolate_ref.pb.go
diff --git a/dm/api/distributor/swarming/v1/isolate_ref.pb.go b/dm/api/distributor/swarming/v1/isolate_ref.pb.go
index ea99f8dfedb5bedb63f65a171ec91ea7b4da0de7..892c73b710af870b1d0da09e23decb6044a2cd18 100644
--- a/dm/api/distributor/swarming/v1/isolate_ref.pb.go
+++ b/dm/api/distributor/swarming/v1/isolate_ref.pb.go
@@ -21,17 +21,17 @@ type IsolatedRef struct {
 func (m *IsolatedRef) Reset()                    { *m = IsolatedRef{} }
 func (m *IsolatedRef) String() string            { return proto.CompactTextString(m) }
 func (*IsolatedRef) ProtoMessage()               {}
-func (*IsolatedRef) Descriptor() ([]byte, []int) { return fileDescriptor1, []int{0} }
+func (*IsolatedRef) Descriptor() ([]byte, []int) { return fileDescriptor2, []int{0} }
 
 func init() {
 	proto.RegisterType((*IsolatedRef)(nil), "swarmingV1.IsolatedRef")
 }
 
 func init() {
-	proto.RegisterFile("github.com/luci/luci-go/dm/api/distributor/swarming/v1/isolate_ref.proto", fileDescriptor1)
+	proto.RegisterFile("github.com/luci/luci-go/dm/api/distributor/swarming/v1/isolate_ref.proto", fileDescriptor2)
 }
 
-var fileDescriptor1 = []byte{
+var fileDescriptor2 = []byte{
 	// 147 bytes of a gzipped FileDescriptorProto
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 	0x28, 0x4d, 0xd2, 0x4b, 0xce, 0xcf, 0xd5, 0xcf, 0x29, 0x4d, 0xce, 0x04, 0x13, 0xba, 0xe9, 0xf9,