third_party/devtools/front_end/Images/readme.md
Adding new icons
- Use Inkscape 0.92 or newer.
 - Choose an existing spritesheet, like 
largeIcons.svg to add the icon to. 
- Make sure to edit the 
src/ version of the svg! 
- Open that file with Inkscape and import the new SVG into the document
 - Place in an open spot, and use guides to scale the icon to a good size, relative to other icons
 - Any straight lines should be snapped to the closest pixel value.
- Use the 
Edit paths by nodes tool (F2) to edit the path directly. - Tweak the X, Y values at the top to be integers.
 
 - Optimize SVGs:
 
./scripts/optimize_svg_images.py
- In 
ui/Icon.js add an entry in UI.Icon.Descriptors.- Look at the spritesheet's axes to identify the correct grid position.
 
 - You may want to regenerate devtools resources:
ninja -C ~/chromium/src/out/Release/ devtools_frontend_resources