Customizing chromium browser

[Sangwon Seo]

Here's the small goal I want to achieve:

- create small dock (like side panel) and put quick link icon (which brings user to certain website); it is exactly same feature with sidebar in Microsoft Edge. simiar with bookmark but unlikely to it, the icons inside is system fixed.

+ I found 
https://source.chromium.org/chromium/chromium/src/+/main:chrome/browser/ui/views/side_panel/side_panel.cc;l=215;bpv=1;bpt=1
this code is about side panel, but I am not sure how could I make my own side panel. 

I spend alomst a week to find which code I have to make a change but it is vast amount of code for me.

Thanks :)