add statistics for IDE help

platform/platform-impl/src/com/intellij/help/impl/HelpManagerImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2015 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@ import com.intellij.ide.IdeBundle;
 import com.intellij.ide.plugins.HelpSetPath;
 import com.intellij.ide.plugins.IdeaPluginDescriptor;
 import com.intellij.ide.plugins.PluginManager;
+import com.intellij.internal.statistic.UsageTrigger;
 import com.intellij.openapi.application.ApplicationInfo;
 import com.intellij.openapi.application.ex.ApplicationInfoEx;
 import com.intellij.openapi.diagnostic.Logger;
@@ -49,6 +50,8 @@ public class HelpManagerImpl extends HelpManager {
   private Object myFXHelpBrowser = null;
 
   public void invokeHelp(@Nullable String id) {
+    UsageTrigger.trigger("ide.help." + id);
+
     if (myHelpSet == null) {
       myHelpSet = createHelpSet();
     }