Web Inspector: [chromium] introduce HeapSnapshot performance test.

Web Inspector: [chromium] introduce HeapSnapshot performance test.
https://bugs.webkit.org/show_bug.cgi?id=80280

Reviewed by Pavel Feldman.

PerformanceTests:

* inspector/detailed-heapshots-smoke-test.html: Added.

Source/WebCore:

* inspector/front-end/HeapSnapshotProxy.js:
(WebInspector.HeapSnapshotLoaderProxy.prototype.finishLoading.updateStaticData):
(WebInspector.HeapSnapshotLoaderProxy.prototype.finishLoading):
(WebInspector.HeapSnapshotLoaderProxy.prototype._callLoadCallbacks):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@109743 268f45cc-cd09-0410-ab3c-d52691b4dbfc