Timeline: fill frames according to CPU time spent per event category

LayoutTests/http/tests/inspector/timeline-test.js

 var initialize_Timeline = function() {
 
 // Scrub values when printing out these properties in the record or data field.
 InspectorTest.timelinePropertyFormatters = {
     children: "formatAsTypeName",
     endTime: "formatAsTypeName",
     requestId: "formatAsTypeName",
     startTime: "formatAsTypeName",
     stackTrace: "formatAsTypeName",
     url: "formatAsURL",
@@ skipping 264 matching lines @@
 
 InspectorTest.FakeFileReader = function(input, delegate, callback)
 {
     this._delegate = delegate;
     this._callback = callback;
     this._input = input;
     this._loadedSize = 0;
     this._fileSize = input.length;
 };
 
+InspectorTest.dumpFrame = function(frame)
+{
+    var fieldsToDump = ["cpuTime", "duration", "startTime", "endTime", "id", "mainThreadFrameId", "isBackground", "timeByCategory", "other", "scripting", "painting", "rendering", "committedFrom"];
+    function formatFields(object)
+    {
+        var result = {};
+        for (var key in object) {
+            if (fieldsToDump.indexOf(key) < 0)
+                continue;
+            var value = object[key];
+            if (typeof value === "number")
+                value = Number(value.toFixed(7));
+            else if (typeof value === "object" && value)
+                value = formatFields(value);
+            result[key] = value;
+        }
+        return result;
+    }
+    InspectorTest.addObject(formatFields(frame));
+}
+
 InspectorTest.FakeFileReader.prototype = {
     start: function(output)
     {
         this._delegate.onTransferStarted(this);
 
         var length = this._input.length;
         var half = (length + 1) >> 1;
 
         var chunk = this._input.substring(0, half);
         this._loadedSize += chunk.length;
@@ skipping 23 matching lines @@
         return this._fileSize;
     },
 
     fileName: function()
     {
         return "fakeFile";
     }
 };
 
 };