[ Do not submit ] Prototype for invalidation analysis

Source/devtools/front_end/timeline/TracingTimelineUIUtils.js

Index: Source/devtools/front_end/timeline/TracingTimelineUIUtils.js
diff --git a/Source/devtools/front_end/timeline/TracingTimelineUIUtils.js b/Source/devtools/front_end/timeline/TracingTimelineUIUtils.js
index 943d718acb0d136e62a16815726aceb0182b2def..ea8905a81b0534021536283fec46c8a17d3e42f6 100644
--- a/Source/devtools/front_end/timeline/TracingTimelineUIUtils.js
+++ b/Source/devtools/front_end/timeline/TracingTimelineUIUtils.js
@@ -632,6 +632,7 @@ WebInspector.TracingTimelineUIUtils._buildTraceEventDetailsSynchronously = funct
     case recordTypes.RecalculateStyles: // We don't want to see default details.
         contentHelper.appendTextRow(WebInspector.UIString("Elements affected"), event.args["elementCount"]);
         callStackLabel = WebInspector.UIString("Styles recalculation forced");
+        // FIXME: Show invalidation tracking for updating style.
         break;
     case recordTypes.Layout:
         var beginData = event.args["beginData"];
@@ -642,6 +643,10 @@ WebInspector.TracingTimelineUIUtils._buildTraceEventDetailsSynchronously = funct
         callSiteStackTraceLabel = WebInspector.UIString("Layout invalidated");
         callStackLabel = WebInspector.UIString("Layout forced");
         relatedNodeLabel = WebInspector.UIString("Layout root");
+        // FIXME: Show invalidation tracking for updating layout.
+        break;
+    case recordTypes.UpdateLayerTree:
+        // FIXME: Show invalidation tracking for updating the layer tree.
         break;
     case recordTypes.ConsoleTime:
         contentHelper.appendTextRow(WebInspector.UIString("Message"), eventData["message"]);
@@ -691,6 +696,17 @@ WebInspector.TracingTimelineUIUtils._buildTraceEventDetailsSynchronously = funct
     }
     if (event.previewElement)
         contentHelper.appendElementRow(WebInspector.UIString("Preview"), event.previewElement);
+
+    // Show invalidation tracking.
+    if (event.styleInvalidationTrackingEvents && event.styleInvalidationTrackingEvents.length) {
+        contentHelper.element.appendChild(
+            this._buildInvalidationDetailsNode("Style invalidations", linkifier, event, event.styleInvalidationTrackingEvents));

[caseq, 2014/08/26 12:19:07]

Display strings should be passed via WebInspector.UIString()

+    }
+    if (event.layoutInvalidationTrackingEvents && event.layoutInvalidationTrackingEvents.length) {
+        contentHelper.element.appendChild(
+            this._buildInvalidationDetailsNode("Layout invalidations", linkifier, event, event.layoutInvalidationTrackingEvents));
+    }
+
     fragment.appendChild(contentHelper.element);
     return fragment;
 }
@@ -801,6 +817,53 @@ WebInspector.TracingTimelineUIUtils._createEventDivider = function(recordType, t
 }
 
 /**
+ * TODO: write me
+ */
+WebInspector.TracingTimelineUIUtils._buildInvalidationDetailsNode = function(title, linkifier, event, invalidationEvents)
+{
+    var detailsNode = document.createElement("div");
+    detailsNode.className = "timeline-details-view-row";
+    var titleElement = document.createElement("span");
+    titleElement.className = "timeline-details-view-row-title";
+    titleElement.textContent = WebInspector.UIString("%s: ", title);
+    detailsNode.appendChild(titleElement);
+    var eventsList = document.createElement("ol");
+    detailsNode.appendChild(eventsList);
+
+    invalidationEvents.forEach(function(invalidationEvent, idx) {

[caseq, 2014/08/26 12:19:08]

Does this produce readable output for large invalidations?

+        var row = document.createElement("li");
+        eventsList.appendChild(row);
+
+        var nodeRow = document.createElement("div");
+        row.appendChild(nodeRow);
+        var target = event.thread.target();
+        var node = target.domModel.nodeForId(invalidationEvent.nodeId);

[caseq, 2014/08/26 12:19:07]

Does this actually work? It looks like it shouldn't...

+        if (node)
+            nodeRow.appendChild(WebInspector.DOMPresentationUtils.linkifyNodeReference(node));
+        else if (invalidationEvent.nodeName)
+            nodeRow.textContent = '[' + invalidationEvent.nodeName + ']';
+        else
+            nodeRow.textContent = '[ unknown node ]';
+
+        var callstack = invalidationEvent.callstack ? JSON.parse(invalidationEvent.callstack) : [];
+        if (callstack.length > 0) {
+            var callstackRow = document.createElement("div");
+            row.appendChild(callstackRow);
+            callstack.forEach(function(stackFrame) {
+                var frameRow = document.createElement("div");
+                frameRow.className = "timeline-details-view-row monospace";
+                callstackRow.appendChild(frameRow);
+                frameRow.textContent = stackFrame.functionName || WebInspector.UIString("(anonymous function)");
+                frameRow.textContent += " @ ";
+                var urlElement = linkifier.linkifyScriptLocation(target, stackFrame.scriptId, stackFrame.url, stackFrame.lineNumber - 1, stackFrame.columnNumber - 1);
+                frameRow.appendChild(urlElement);
+            });
+        }
+    });
+    return detailsNode;
+}
+
+/**
  * @return {!Array.<string>}
  */
 WebInspector.TracingTimelineUIUtils._visibleTypes = function()