Timeline: add labels around status bar controls

Source/devtools/front_end/timeline/TimelinePanel.js

Index: Source/devtools/front_end/timeline/TimelinePanel.js
diff --git a/Source/devtools/front_end/timeline/TimelinePanel.js b/Source/devtools/front_end/timeline/TimelinePanel.js
index 65e8174bc3bbc13fba8e351ba0618e196c784165..74067c335b7fb2f15f894305114fdbc9fdbbc3af 100644
--- a/Source/devtools/front_end/timeline/TimelinePanel.js
+++ b/Source/devtools/front_end/timeline/TimelinePanel.js
@@ -308,6 +308,9 @@ WebInspector.TimelinePanel.prototype = {
         garbageCollectButton.addEventListener("click", this._garbageCollectButtonClicked, this);
         this._panelToolbar.appendStatusBarItem(garbageCollectButton);
 
+        var viewModeLabel = new WebInspector.StatusBarText(WebInspector.UIString("View Mode:"), "timeline-status-bar-group-label");
+        this._panelToolbar.appendStatusBarItem(viewModeLabel);
+
         var framesToggleButton = new WebInspector.StatusBarButton(WebInspector.UIString("Frames view. (Activity split into frames)"), "histogram-status-bar-item");
         framesToggleButton.setToggled(this._overviewModeSetting.get() === WebInspector.TimelinePanel.OverviewMode.Frames);
         framesToggleButton.addEventListener("click", this._overviewModeChanged.bind(this, framesToggleButton));
@@ -318,6 +321,9 @@ WebInspector.TimelinePanel.prototype = {
         this._flameChartToggleButton.addEventListener("click", this._flameChartEnabledChanged.bind(this));
         this._panelToolbar.appendStatusBarItem(this._flameChartToggleButton);
 
+        var captureSettingsLabel = new WebInspector.StatusBarText(WebInspector.UIString("Capture Details:"), "timeline-status-bar-group-label");
+        this._panelToolbar.appendStatusBarItem(captureSettingsLabel);
+
         this._captureCausesSetting = WebInspector.settings.createSetting("timelineCaptureCauses", true);
         this._captureCausesSetting.addChangeListener(this._refreshViews, this);
         this._panelToolbar.appendStatusBarItem(this._createSettingCheckbox(WebInspector.UIString("Causes"),