[DevTools] Make resource tree model optional

third_party/WebKit/Source/devtools/front_end/animation/AnimationModel.js

Index: third_party/WebKit/Source/devtools/front_end/animation/AnimationModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/animation/AnimationModel.js b/third_party/WebKit/Source/devtools/front_end/animation/AnimationModel.js
index 4d4dcca0215b04030f4e0149b120f78ce3fab1ee..1f25a41642563b1539a84edf65ed056f5ba37b2a 100644
--- a/third_party/WebKit/Source/devtools/front_end/animation/AnimationModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/animation/AnimationModel.js
@@ -20,7 +20,9 @@ WebInspector.AnimationModel = function(target)
     /** @type {!Array.<string>} */
     this._pendingAnimations = [];
     this._playbackRate = 1;
-    target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._reset, this);
+    var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
+    if (resourceTreeModel)

[pfeldman, 2016/07/07 17:44:13]

No need in this check - we should either have both resourcetreemodel and
animation, or none.

[eostroukhov-old, 2016/07/13 23:30:58]

To signify the dependency, I turned resourceTreeModel into ctor parameter.

+        resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._reset, this);
     this._screenshotCapture = new WebInspector.AnimationModel.ScreenshotCapture(target, this);
 }
 
@@ -883,7 +885,9 @@ WebInspector.AnimationModel.ScreenshotCapture = function(target, model)
     this._target = target;
     /** @type {!Array<!WebInspector.AnimationModel.ScreenshotCapture.Request>} */
     this._requests = [];
-    this._target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.ScreencastFrame, this._screencastFrame, this);
+    var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(this._target);
+    if (resourceTreeModel)

[pfeldman, 2016/07/07 17:44:13]

ditto

[eostroukhov-old, 2016/07/13 23:30:58]

Done.

+        resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.ScreencastFrame, this._screencastFrame, this);
     this._model = model;
     this._model.addEventListener(WebInspector.AnimationModel.Events.ModelReset, this._stopScreencast, this);
 }