platform/platform-resources/src/META-INF/xdebugger.xml

<idea-plugin>
  <project-components>
    <component>
      <interface-class>com.intellij.xdebugger.XDebuggerManager</interface-class>
      <implementation-class>com.intellij.xdebugger.impl.XDebuggerManagerImpl</implementation-class>
    </component>
  </project-components>

  <extensionPoints>
    <extensionPoint name="xdebugger.settings" interface="com.intellij.xdebugger.settings.XDebuggerSettings"/>
    <extensionPoint name="xdebugger.breakpointType" interface="com.intellij.xdebugger.breakpoints.XBreakpointType"/>
    <extensionPoint name="xdebugger.debuggerSupport" interface="com.intellij.xdebugger.impl.DebuggerSupport"/>
  </extensionPoints>

  <extensions defaultExtensionNs="com.intellij">
    <colorSettingsPage implementation="com.intellij.xdebugger.impl.ui.DebuggerColorsPage"/>

    <applicationService serviceInterface="com.intellij.xdebugger.impl.settings.XDebuggerSettingsManager"
                        serviceImplementation="com.intellij.xdebugger.impl.settings.XDebuggerSettingsManager"/>

    <applicationService serviceInterface="com.intellij.xdebugger.XDebuggerUtil"
                        serviceImplementation="com.intellij.xdebugger.impl.XDebuggerUtilImpl"/>

    <projectService serviceImplementation="com.intellij.xdebugger.impl.evaluate.quick.common.ValueLookupManager"/>

    <projectService serviceInterface="com.intellij.xdebugger.impl.breakpoints.ui.BreakpointsMasterDetailPopupFactory"
                    serviceImplementation="com.intellij.xdebugger.impl.breakpoints.ui.BreakpointsMasterDetailPopupFactory"/>

    <projectService serviceInterface="com.intellij.xdebugger.impl.XDebuggerHistoryManager"
                    serviceImplementation="com.intellij.xdebugger.impl.XDebuggerHistoryManager"/>

    <applicationConfigurable provider="com.intellij.xdebugger.impl.settings.DebuggerConfigurableProvider"/>

    <customizableActionGroupProvider implementation="com.intellij.xdebugger.impl.ui.XDebugTabCustomizableActionGroupProvider"/>

    <xdebugger.debuggerSupport implementation="com.intellij.xdebugger.impl.XDebuggerSupport" order="first"/>

    <executor implementation="com.intellij.execution.executors.DefaultDebugExecutor" order="first,after run"/>
  </extensions>
</idea-plugin>