Performance tool Improvements

JavaScript profiler and UI Responsiveness tool integrated into a new tool profiler.

User Measures

• Annotate the timeline using the window.performance object.
• Filter down the profiler to that scenario

performance.mark("ExampleScenario-Begin");
doStuff();
performance.mark("ExampleScenario-End");
performance.measure("Example Scenario", "ExampleScenario-Begin", "ExampleScenario-End");

DOM Explorer Integration

• Element highlighting
• Inspect element from the timeline