SideBySide2: Add preference for a subset of supported CM3 themes

Add support for CM3 themes. CM3 has built in support for themes.
Unfortunately we can not use all of them out of the box, because
we set statically background colors on diff styles.  However we
can use light themes. Especially "eclipse" theme looks very sexy
for Java developers that use this IDE and are acquainted with its
look and feel.

Integrate all supported themes in Buck tool chain, so that we are
prepared to extend the support for dark themes. To do that we must
dynamically assign background colors for different diff styles per
theme.

Change-Id: Ic97c237d789dc4daeff6b8bb4f7606da83f5d532

gerrit-server/src/main/java/com/google/gerrit/server/schema/Schema_93.java

@@ -0,0 +1,25 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.schema;
+
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+
+public class Schema_93 extends SchemaVersion {
+  @Inject
+  Schema_93(Provider<Schema_92> prior) {
+    super(prior);
+  }
+}