[DevTools] Host paint profiles in PaintProfilerModel

third_party/WebKit/Source/devtools/front_end/timeline_model/TracingLayerTree.js

Index: third_party/WebKit/Source/devtools/front_end/timeline_model/TracingLayerTree.js
diff --git a/third_party/WebKit/Source/devtools/front_end/timeline_model/TracingLayerTree.js b/third_party/WebKit/Source/devtools/front_end/timeline_model/TracingLayerTree.js
index 37cca1190dfe78c68ccd2cb2eb142b308f889bc3..510dba2b47c7b0db3df9d35f852cd36bbffbd98e 100644
--- a/third_party/WebKit/Source/devtools/front_end/timeline_model/TracingLayerTree.js
+++ b/third_party/WebKit/Source/devtools/front_end/timeline_model/TracingLayerTree.js
@@ -387,14 +387,15 @@ TimelineModel.TracingLayer = class {
       var fragments =
           pictures.filter(picture => picture && rectsOverlap(picture.rect, targetRect))
               .map(picture => ({x: picture.rect[0], y: picture.rect[1], picture: picture.serializedPicture}));
-      if (!fragments.length || !this._target)

[caseq1, 2017/04/27 21:19:22]

That's about the only place we needed target here, so perhaps you want to
convert this one to keep PaintProfilerModel as well?

[dgozman, 2017/04/28 00:07:33]

Done.

+      var paintProfilerModel = this._target && this._target.model(SDK.PaintProfilerModel);
+      if (!fragments.length || !paintProfilerModel)
         return null;
       var x0 = fragments.reduce((min, item) => Math.min(min, item.x), Infinity);
       var y0 = fragments.reduce((min, item) => Math.min(min, item.y), Infinity);
       // Rect is in layer content coordinates, make it relative to picture by offsetting to the top left corner.
       var rect = {x: targetRect[0] - x0, y: targetRect[1] - y0, width: targetRect[2], height: targetRect[3]};
-      return SDK.PaintProfilerSnapshot.loadFromFragments(this._target, fragments)
-          .then(snapshot => snapshot ? {rect: rect, snapshot: snapshot} : null);
+      return paintProfilerModel.loadSnapshotFromFragments(fragments).then(
+          snapshot => snapshot ? {rect: rect, snapshot: snapshot} : null);
     });
 
     /**