Define gerrit-extension-api module

This module will hold a set of thin interfaces that extensions can
build against. Extensions are more lightweight than plugins and have
a smaller surface of the Gerrit server available to them.

Change-Id: I4213004f1ba5c034cf8fc7fbb9f6dd53f3ec8a96

gerrit-extension-api/pom.xml

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (C) 2012 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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>com.google.gerrit</groupId>
+    <artifactId>gerrit-parent</artifactId>
+    <version>2.5-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>gerrit-extension-api</artifactId>
+  <name>Gerrit Code Review - Extension API</name>
+
+  <description>
+    Interfaces describing the extension API
+  </description>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.inject</groupId>
+      <artifactId>guice</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>com.google.inject.extensions</groupId>
+      <artifactId>guice-servlet</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.apache.tomcat</groupId>
+      <artifactId>servlet-api</artifactId>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <configuration>
+          <createSourcesJar>true</createSourcesJar>
+        </configuration>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>