UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.86 Safari/537.36

Steps to reproduce the problem:
This is an improvement/suggestion.

Current:
Right now, DevTools will only hook to the page when it's opened. Meaning any network events will not be recorded until is opened.

What is the expected behavior?
Improvement:
Implement a DevTools' setting where user can toggle an option to make DevTools always hook to the pages, independent of having it opened or not. 

What went wrong?
Why/Pros:
As a web developer, sometimes we must investigate defects or stumble upon them on a daily basis. This would save time as Network panel would record all ajax and files, enabling us to check the Network tab right away, without having to refresh the page to start the flow all over again because DevTools wasn't open at the time. This is most critical on one-time scenarios, like error on first attempt or one-time pages (order confirmation page, for e.g.).

Cons:
This might make Chrome spend more resources (ram, cpu, etc) since it would be hooking on all pages, but that setting could be implemented as an Experiment, meaning need some flag toggled beforehand @ chrome://flags/ in order to avoid common users to not toggle it by mistake and complain about "Chrome is slow", "Chrome is using XXgb ram" and etc.

Did this work before? N/A 

Chrome version: 50.0.2661.86  Channel: n/a
OS Version: OS X 10.10.5
Flash Version: Shockwave Flash 21.0 r0

Discussion @ DevTools From: 
https://groups.google.com/forum/#!topic/google-chrome-developer-tools/15zWYh4d_ck