DevTools: move the "Capture *" checkboxes from timeline sidebar to the toolbar.

Source/devtools/front_end/timeline/TimelineFrameOverview.js

Index: Source/devtools/front_end/timeline/TimelineFrameOverview.js
diff --git a/Source/devtools/front_end/timeline/TimelineFrameOverview.js b/Source/devtools/front_end/timeline/TimelineFrameOverview.js
index 0672b6b281ecc0060dad63f3b04e00b94f8636a3..399a2fb5c412fe38ba0a05f9dad4be0b45d62ffb 100644
--- a/Source/devtools/front_end/timeline/TimelineFrameOverview.js
+++ b/Source/devtools/front_end/timeline/TimelineFrameOverview.js
@@ -136,6 +136,11 @@ WebInspector.TimelineFrameOverview.prototype = {
      */
     _computeTargetFrameLength: function(frames)
     {
+        const targetFPS = 20;
+        var result = 1000.0 / targetFPS;
+        if (!frames.length)
+            return result;
+
         var durations = [];
         for (var i = 0; i < frames.length; ++i) {
             if (frames[i])
@@ -145,8 +150,6 @@ WebInspector.TimelineFrameOverview.prototype = {
 
         // Optimize appearance for 30fps, but leave some space so it's evident when a frame overflows.
         // However, if at least half frames won't fit at this scale, fall back to using autoscale.
-        const targetFPS = 20;
-        var result = 1000.0 / targetFPS;
         if (result >= medianFrameLength)
             return result;