Add snapshotting for CIPD packages and dimensions to DM.

dm/api/distributor/swarming/v1/cipd.go

Index: dm/api/distributor/swarming/v1/cipd.go
diff --git a/dm/api/distributor/swarming/v1/cipd.go b/dm/api/distributor/swarming/v1/cipd.go
new file mode 100644
index 0000000000000000000000000000000000000000..696187847e207170c25916ebc3faee8fe29da41b
--- /dev/null
+++ b/dm/api/distributor/swarming/v1/cipd.go
@@ -0,0 +1,46 @@
+// Copyright 2016 The LUCI Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+package swarmingV1
+
+import (
+	"sort"
+
+	swarm "github.com/luci/luci-go/common/api/swarming/swarming/v1"
+)
+
+// ToCipdPackage converts this to a swarming api SwarmingRpcsCipdPackage.
+func (c *CipdPackage) ToCipdPackage() *swarm.SwarmingRpcsCipdPackage {
+	if c == nil {
+		return nil
+	}
+	return &swarm.SwarmingRpcsCipdPackage{PackageName: c.Name, Version: c.Version}
+}
+
+// ToCipdInput converts this to a swarming api SwarmingRpcsCipdInput.
+func (c *CipdSpec) ToCipdInput() *swarm.SwarmingRpcsCipdInput {
+	if c == nil || c.Client == nil && len(c.ByPath) == 0 {
+		return nil
+	}
+	ret := &swarm.SwarmingRpcsCipdInput{
+		ClientPackage: c.Client.ToCipdPackage(),
+	}
+	if len(c.ByPath) > 0 {
+		count := 0
+		paths := make(sort.StringSlice, 0, len(c.ByPath))
+		for path, pkgs := range c.ByPath {
+			paths = append(paths, path)
+			count += len(pkgs.Pkg)
+		}
+		ret.Packages = make([]*swarm.SwarmingRpcsCipdPackage, 0, count)
+		for _, path := range paths {
+			for _, pkg := range c.ByPath[path].Pkg {
+				retPkg := pkg.ToCipdPackage()
+				retPkg.Path = path
+				ret.Packages = append(ret.Packages, retPkg)
+			}
+		}
+	}
+	return ret
+}