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
/**
	 * Background color used for parameter hints. RGB color encoded using PreferenceConverter.
	 * @see org.eclipse.jface.resource.StringConverter
	 * @see org.eclipse.jface.preference.PreferenceConverter
	 */
	public final static String CODEASSIST_PARAMETERS_BACKGROUND= ContentAssistPreference.PARAMETERS_BACKGROUND;
	/**
	 * Foreground color used for parameter hints. RGB color encoded using PreferenceConverter.
	 * @see org.eclipse.jface.resource.StringConverter
	 * @see org.eclipse.jface.preference.PreferenceConverter
	 */
	public final static String CODEASSIST_PARAMETERS_FOREGROUND= ContentAssistPreference.PARAMETERS_FOREGROUND;
	/**
	 * Sets the behaviour of the refactoring wizard for showing the error page. String value:
	 * REFACTOR_FATAL_SEVERITY, REFACTOR_ERROR_SEVERITY, REFACTOR_WARNING_SEVERITY, REFACTOR_INFO_SEVERITY or REFACTOR_OK_SEVERITY.
	 */
	public static final String REFACTOR_ERROR_PAGE_SEVERITY_THRESHOLD= RefactoringPreferencePage.PREF_ERROR_PAGE_SEVERITY_THRESHOLD;
	/**
	 * String value used by REFACTOR_ERROR_PAGE_SEVERITY_THRESHOLD.
	 */
	public static final String REFACTOR_FATAL_SEVERITY= RefactoringPreferencePage.FATAL_SEVERITY;
	
	/**
	 * String value used by REFACTOR_ERROR_PAGE_SEVERITY_THRESHOLD.
	 */	
	public static final String REFACTOR_ERROR_SEVERITY= RefactoringPreferencePage.ERROR_SEVERITY;
	/**
	 * String value used by REFACTOR_ERROR_PAGE_SEVERITY_THRESHOLD.
	 */
	public static final String REFACTOR_WARNING_SEVERITY= RefactoringPreferencePage.WARNING_SEVERITY;