Duplication in Component Builds

[Andrew Grieve]

I was looking at why android component builds are so big, and I think the main reason is that we're not very good about defining GN component() targets.

I've captured findings here: https://crbug.com/403382663

• is_component_build=true: 1.2gb
• is_component_build=false: 749M

I created this spreadsheet to show which object files are being duplicated.

Seems likely there are quick wins in there, but also likely that it's a lot of work to get it into a good state.

Anyone want to chip in? Maybe we can create a bit of a rotation to try and create one new component per day?