[Metrics] Move CachingPermutedEntropyProvider into the variations component.

components/variations/pref_names.h

Index: components/variations/pref_names.h
diff --git a/components/variations/pref_names.h b/components/variations/pref_names.h
new file mode 100644
index 0000000000000000000000000000000000000000..19fd9c235ba7455a4682e898a63341e856c43e96
--- /dev/null
+++ b/components/variations/pref_names.h
@@ -0,0 +1,18 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_VARIATIONS_PREF_NAMES_H_
+#define COMPONENTS_VARIATIONS_PREF_NAMES_H_
+
+namespace metrics {

[blundell, 2014/05/19 11:04:32]

namespace variations?

[Ilya Sherman, 2014/05/19 11:16:27]

Using "metrics" for consistency with the other files in the variations
component.  We should eventually switch over to "variations", but it probably
makes sense to do that all at once for the whole component.

+namespace prefs {
+
+// Alphabetical list of preference names specific to the variations component.
+// Keep alphabetized, and document each in the .cc file.
+extern const char kVariationsPermutedEntropyCache[];
+
+}  // namespace prefs
+}  // namespace metrics
+
+#endif  // COMPONENTS_VARIATIONS_PREF_NAMES_H_