Add and start using Checkstyle 5.7

third_party/checkstyle/import-control.xml

Index: third_party/checkstyle/import-control.xml
diff --git a/third_party/checkstyle/import-control.xml b/third_party/checkstyle/import-control.xml
new file mode 100644
index 0000000000000000000000000000000000000000..c06279f0ae4ac84c64f9443bed4b00e99536ccc6
--- /dev/null
+++ b/third_party/checkstyle/import-control.xml
@@ -0,0 +1,62 @@
+<?xml version="1.0"?>
+<!DOCTYPE import-control PUBLIC
+    "-//Puppy Crawl//DTD Import Control 1.1//EN"
+    "http://www.puppycrawl.com/dtds/import_control_1_1.dtd">
+
+<import-control pkg="com.puppycrawl.tools.checkstyle">
+
+  <allow pkg="antlr"/>
+  <allow pkg="com.google.common.base"/>
+  <allow pkg="com.google.common.collect"/>
+  <allow pkg="com.puppycrawl.tools.checkstyle.api"/>
+  <allow pkg="java.io"/>
+  <allow pkg="java.net"/>
+  <allow pkg="java.nio"/>
+  <allow pkg="java.util"/>
+  <allow pkg="javax.xml.parsers"/>
+  <allow pkg="org.apache.commons.beanutils"/>
+  <allow pkg="org.apache.commons.logging"/>
+  <allow pkg="org.xml.sax"/>
+
+  <!-- The local ones -->
+  <allow class="java.security.MessageDigest" local-only="true"/>
+  <allow pkg="com.puppycrawl.tools.checkstyle.grammars" local-only="true"/>
+  <allow pkg="org.apache.commons.cli" local-only="true"/>
+  <allow pkg="org.apache.tools.ant" local-only="true"/>
+
+  <subpackage name="api">
+    <allow pkg="java.beans"/>
+    <allow pkg="java.lang.reflect"/>
+    <allow pkg="java.text"/>
+    <allow class="com.puppycrawl.tools.checkstyle.grammars.CommentListener"
+           local-only="true"/>
+    <allow class="com.puppycrawl.tools.checkstyle.grammars.GeneratedJavaTokenTypes"
+           local-only="true"/>
+  </subpackage>
+
+  <subpackage name="checks">
+    <allow pkg="com.puppycrawl.tools.checkstyle.checks"/>
+    <allow class="com.puppycrawl.tools.checkstyle.Defn"/>
+    <allow pkg="java.math"/>
+
+    <subpackage name="indentation">
+      <allow pkg="java.lang.reflect"/>
+    </subpackage>
+    <subpackage name="header">
+      <allow class="java.nio.charset.Charset" local-only="true"/>
+    </subpackage>
+  </subpackage>
+
+  <subpackage name="doclets">
+    <allow pkg="com.sun.javadoc"/>
+  </subpackage>
+
+  <subpackage name="filters">
+    <allow pkg="java.lang.ref"/>
+  </subpackage>
+
+  <subpackage name="gui">
+    <allow pkg="java.awt"/>
+    <allow pkg="javax.swing"/>
+  </subpackage>
+</import-control>