src/META-INF/plugin.xml

<idea-plugin>
  <id>com.google.appindexing</id>
  <name>Firebase App Indexing</name>
  <version>0.1</version>
  <vendor>Google</vendor>

  <description>
    Provides tools for Firebase App Indexing.
  </description>

  <!-- please see https://confluence.jetbrains.com/display/IDEADEV/Build+Number+Ranges for description -->
  <idea-version since-build="107.105"/>

  <depends>org.jetbrains.android</depends>
  <depends>com.google.urlassistant</depends>
  <depends>org.intellij.groovy</depends>

  <extensions defaultExtensionNs="com.intellij">
    <fileEditorProvider implementation="com.google.appindexing.editor.AppIndexingFileEditorProvider"/>
  </extensions>

  <extensions defaultExtensionNs="com.android.tools.idea.assistant">
    <actionHandler implementation="com.google.appindexing.actions.ShowAppIndexingDialogAction"/>
    <actionHandler implementation="com.google.appindexing.actions.InsertApiCodeAction"/>
    <actionHandler implementation="com.google.appindexing.actions.CheckUserActionErrorAction"/>
    <actionHandler implementation="com.google.appindexing.actions.CheckPersonalContentIndexingErrorAction"/>
    <actionHandler implementation="com.google.urlassistant.actions.UrlMapperAction"/>
    <actionHandler implementation="com.google.urlassistant.actions.DalGeneratorAction"/>
    <actionHandler implementation="com.google.urlassistant.actions.InsertCodeDialogAction"/>
    <actionHandler implementation="com.google.urlassistant.actions.OpenTestAppLinkPanelAction"/>
  </extensions>

</idea-plugin>