DevTools: Merge main thread strips on timeline overview into a single one.

Source/devtools/front_end/timeline/TimelineUIUtils.js

Index: Source/devtools/front_end/timeline/TimelineUIUtils.js
diff --git a/Source/devtools/front_end/timeline/TimelineUIUtils.js b/Source/devtools/front_end/timeline/TimelineUIUtils.js
index 82c410050bbfa4e3fe5da7ef3de7d1a48355b36a..449ee43c90cfc39ec55eef6cbed651c2e829d1a8 100644
--- a/Source/devtools/front_end/timeline/TimelineUIUtils.js
+++ b/Source/devtools/front_end/timeline/TimelineUIUtils.js
@@ -1188,13 +1188,13 @@ WebInspector.TimelineUIUtils.categories = function()
     if (WebInspector.TimelineUIUtils._categories)
         return WebInspector.TimelineUIUtils._categories;
     WebInspector.TimelineUIUtils._categories = {
-        loading: new WebInspector.TimelineCategory("loading", WebInspector.UIString("Loading"), 0, "hsl(214, 53%, 58%)", "hsl(214, 67%, 90%)", "hsl(214, 67%, 74%)", "hsl(214, 67%, 66%)"),
-        scripting: new WebInspector.TimelineCategory("scripting", WebInspector.UIString("Scripting"), 1, "hsl(43, 90%, 45%)", "hsl(43, 83%, 90%)", "hsl(43, 83%, 72%)", "hsl(43, 83%, 64%) "),
-        rendering: new WebInspector.TimelineCategory("rendering", WebInspector.UIString("Rendering"), 2, "hsl(256, 50%, 60%)", "hsl(256, 67%, 90%)", "hsl(256, 67%, 76%)", "hsl(256, 67%, 70%)"),
-        painting: new WebInspector.TimelineCategory("painting", WebInspector.UIString("Painting"), 2, "hsl(109, 33%, 47%)", "hsl(109, 33%, 90%)", "hsl(109, 33%, 64%)", "hsl(109, 33%, 55%)"),
-        gpu: new WebInspector.TimelineCategory("gpu", WebInspector.UIString("GPU"), -1, "hsl(240, 24%, 45%)", "hsl(240, 24%, 90%)", "hsl(240, 24%, 73%)", "hsl(240, 24%, 66%)"),
-        other: new WebInspector.TimelineCategory("other", WebInspector.UIString("Other"), -1, "hsl(0, 0%, 73%)", "hsl(0, 0%, 90%)", "hsl(0, 0%, 87%)", "hsl(0, 0%, 79%)"),
-        idle: new WebInspector.TimelineCategory("idle", WebInspector.UIString("Idle"), -1, "hsl(0, 0%, 87%)", "hsl(0, 100%, 100%)", "hsl(0, 100%, 100%)", "hsl(0, 100%, 100%)")
+        loading: new WebInspector.TimelineCategory("loading", WebInspector.UIString("Loading"), true, "hsl(214, 53%, 58%)", "hsl(214, 67%, 90%)", "hsl(214, 67%, 74%)", "hsl(214, 67%, 66%)"),
+        scripting: new WebInspector.TimelineCategory("scripting", WebInspector.UIString("Scripting"), true, "hsl(43, 90%, 45%)", "hsl(43, 83%, 90%)", "hsl(43, 83%, 72%)", "hsl(43, 83%, 64%) "),
+        rendering: new WebInspector.TimelineCategory("rendering", WebInspector.UIString("Rendering"), true, "hsl(256, 50%, 60%)", "hsl(256, 67%, 90%)", "hsl(256, 67%, 76%)", "hsl(256, 67%, 70%)"),
+        painting: new WebInspector.TimelineCategory("painting", WebInspector.UIString("Painting"), true, "hsl(109, 33%, 47%)", "hsl(109, 33%, 90%)", "hsl(109, 33%, 64%)", "hsl(109, 33%, 55%)"),
+        gpu: new WebInspector.TimelineCategory("gpu", WebInspector.UIString("GPU"), false, "hsl(240, 24%, 45%)", "hsl(240, 24%, 90%)", "hsl(240, 24%, 73%)", "hsl(240, 24%, 66%)"),
+        other: new WebInspector.TimelineCategory("other", WebInspector.UIString("Other"), false, "hsl(0, 0%, 73%)", "hsl(0, 0%, 90%)", "hsl(0, 0%, 87%)", "hsl(0, 0%, 79%)"),
+        idle: new WebInspector.TimelineCategory("idle", WebInspector.UIString("Idle"), false, "hsl(0, 0%, 87%)", "hsl(0, 100%, 100%)", "hsl(0, 100%, 100%)", "hsl(0, 100%, 100%)")
     };
     return WebInspector.TimelineUIUtils._categories;
 };
@@ -1387,17 +1387,17 @@ WebInspector.TimelineUIUtils.quadHeight = function(quad)
  * @extends {WebInspector.Object}
  * @param {string} name
  * @param {string} title
- * @param {number} overviewStripGroupIndex
+ * @param {boolean} visible
  * @param {string} borderColor
  * @param {string} backgroundColor
  * @param {string} fillColorStop0
  * @param {string} fillColorStop1
  */
-WebInspector.TimelineCategory = function(name, title, overviewStripGroupIndex, borderColor, backgroundColor, fillColorStop0, fillColorStop1)
+WebInspector.TimelineCategory = function(name, title, visible, borderColor, backgroundColor, fillColorStop0, fillColorStop1)
 {
     this.name = name;
     this.title = title;
-    this.overviewStripGroupIndex = overviewStripGroupIndex;
+    this.visible = visible;
     this.borderColor = borderColor;
     this.backgroundColor = backgroundColor;
     this.fillColorStop0 = fillColorStop0;