Bug 49117 [Plan Item] Workbench needs hooks for new welcome support
M6 We need to provide an extension point and some interfaces to allow for a primary feature to declare a welcome page. This extension point will be tied the new IProduct being defined by the Core team and needs to have 3 states 1) Fill whole screen 2) Collapsed on the right when the user selects something and starts working 3) Disables when it is no longer of any use
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchPlugin.java
if (cachedAboutInfos == null) {
			cachedAboutInfos = readFeatureInfos();
		}
		return cachedAboutInfos;
	}
	/**
	 * Returns the about information of the primary feature.
	 * 
	 * @return info about the primary feature, or <code>null</code> if there 
	 * is no primary feature or if this information is unavailable
	 */
	public AboutInfo getPrimaryInfo() {
		IPlatformConfiguration conf = BootLoader.getCurrentPlatformConfiguration();
		String featureId = conf.getPrimaryFeatureIdentifier();
		if (featureId == null) {
			return null;
		}
		if (cachedAboutInfos == null) {
			cachedAboutInfos = readFeatureInfos();
		}
		for (int i = 0; i < cachedAboutInfos.length; i++) {
			if (featureId.equals(cachedAboutInfos[i].getFeatureId())) {
				return cachedAboutInfos[i];
			}
		}
		return null;
	}
	
}