Add code highlighting metrics tracking

idea/idea-core/src/org/jetbrains/kotlin/idea/statistics/CodeHighlightingFUSCollector.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.statistics
+
+object CodeHighlightingFUSCollector {
+
+    fun log(highlightingType: HighlightingType, duration: Long, LOC: Int) {
+        val data = mapOf(
+            "highlighting type" to highlightingType.text,
+            "duration" to duration.toString(),
+            "lines count" to LOC.toString()
+        )
+
+        KotlinFUSLogger.log(FUSEventGroups.Editor, "Highlighting", data)
+    }
+
+    enum class HighlightingType(val text: String) {
+        CODE_ANALYSIS("Code analysis"), ERROR("Error diagnostics");
+    }
+}