Bug 15604 Promote Fill arguments on method completion to a real preference
It is still in work in progress but it has become an established feature by now. Promote the preference to the code assist preference page.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferencesConstants.java
/**
	 * Enable / Disable ordering of code assist proposals. Boolean value.
	 */
	public final static String CODEASSIST_ORDER_PROPOSALS= ContentAssistPreference.ORDER_PROPOSALS;
	/**
	 * Enable / Disable filling argument names for method completions. Boolean value.
	 */
	public final static String CODEASSIST_FILL_ARGUMENT_NAMES= ExperimentalPreference.CODE_ASSIST_EXPERIMENTAL;
	/**
	 * The characters that select an entry in the code assist selection dialog on Java code. String value. String containing all characters.
	 */
	public final static String CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA= ContentAssistPreference.AUTOACTIVATION_TRIGGERS_JAVA;
	/**
	 * The characters that select an entry in the code assist selection dialog on Javadoc code. String value. String containing all characters.
	 */
	public final static String CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVADOC= ContentAssistPreference.AUTOACTIVATION_TRIGGERS_JAVADOC;
	/**
	 * Background color used in the code assist selection dialog. RGB color encoded using PreferenceConverter.
	 * @see org.eclipse.jface.resource.StringConverter
	 * @see org.eclipse.jface.preference.PreferenceConverter
	 */
	public final static String CODEASSIST_PROPOSALS_BACKGROUND= ContentAssistPreference.PROPOSALS_BACKGROUND;
	/**
	 * Foreground color used in the code assist selection dialog. RGB color encoded using PreferenceConverter.
	 * @see org.eclipse.jface.resource.StringConverter
	 * @see org.eclipse.jface.preference.PreferenceConverter
	 */
	public final static String CODEASSIST_PROPOSALS_FOREGROUND= ContentAssistPreference.PROPOSALS_FOREGROUND;