When trying to use the ash dev tool
https://www.chromium.org/developers/how-tos/inspecting-ash

It appears that the inspector tool will break whenever the launcher is triggered. Sometimes the overlay won't show, sometimes the devtool won't select the node when pinning a ui element. 

When the launcher is opening, there is a visible multi-seconds pause on the UI. Looking at the console log, there are thousands of these logs below that flush the screen.

[31611:31611:1010/101411.205174:ERROR:http_server.cc(99)] Write buffer is full.
[31611:31611:1010/101411.205191:ERROR:http_server.cc(99)] Write buffer is full.
[31611:31611:1010/101411.205207:ERROR:http_server.cc(99)] Write buffer is full.
[31611:31611:1010/101411.205244:ERROR:http_server.cc(99)] Write buffer is full.

Looking at the code, it seems the devtools is sending ui updates to the frontend through http web socket. The http server's buffer is overflowing by too many requests to update.

It appears the launcher has many views, a few hundreds, and the current devtool update algorithm is not very efficient, looks like O(n^2) where n is number of views. So it is sending tens of thousands of updates to the frontend all at once, which overflowed the http server buffer. 

I will take a first stab to see if we can make it fast.