Timeline: promisify paint profiler and Layers panel, part I

third_party/WebKit/Source/devtools/front_end/timeline/TimelineUIUtils.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 1390 matching lines @@
     return hasChildren;
 }
 
 /**
  * @param {!WebInspector.TracingModel.Event} event
  * @param {!WebInspector.Target} target
  * @param {function(!Element=)} callback
  */
 WebInspector.TimelineUIUtils.buildPicturePreviewContent = function(event, target, callback)
 {
-    new WebInspector.LayerPaintEvent(event, target).loadSnapshot(onSnapshotLoaded);
+    new WebInspector.LayerPaintEvent(event, target).snapshotPromise().then(onSnapshotLoaded);
     /**
-     * @param {?Array.<number>} rect
-     * @param {?WebInspector.PaintProfilerSnapshot} snapshot
+     * @param {?{rect: !Array<number>, snapshot: !WebInspector.PaintProfilerSnapshot}} snapshotWithRect
      */
-    function onSnapshotLoaded(rect, snapshot)
+    function onSnapshotLoaded(snapshotWithRect)
     {
-        if (!snapshot) {
+        if (!snapshotWithRect) {
             callback();
             return;
         }
-        snapshot.requestImage(null, null, 1, onGotImage);
-        snapshot.dispose();
+        snapshotWithRect.snapshot.requestImage(null, null, 1, onGotImage);
+        snapshotWithRect.snapshot.dispose();
     }
 
     /**
      * @param {string=} imageURL
      */
     function onGotImage(imageURL)
     {
         if (!imageURL) {
             callback();
             return;
@@ skipping 711 matching lines @@
     case warnings.V8Deopt:
         span.appendChild(WebInspector.linkifyURLAsNode("https://github.com/GoogleChrome/devtools-docs/issues/53",
             WebInspector.UIString("Not optimized"), undefined, true));
         span.createTextChild(WebInspector.UIString(": %s", eventData["deoptReason"]));
         break;
     default:
         console.assert(false, "Unhandled TimelineModel.WarningType");
     }
     return span;
 }