Cache is recorded separately, currently at 205Mb. I wonder if it is a question of how the figures are being displayed in different versions of Android.
The cache doesn't seem relevant but I could test that. Presently my breakdown is 189MB+21MB , App+data, and 13MB Cache.
Uninstalled.
Reinstalled. (play store reports 30MB download)
Before opening the app 65MB+4KB, 0MB cache
First launch (no sync sign-in) 65MB + 10MB, 60KB cache
Browsed Noisy SSL page (google plus feed): 65MB + 14MB, 13MB cache
Signed into sync: no change ( 10min later, no change)
Browsed image heavy site (imgur): 65MB + 14MB, 25MB cache
Does chrome store the old versions on upgrade? That would perfectly explain why my fresh install is 64MB, and my older isntall was 3x that size.
It does on the desktop: Omaha, a.k.a. Google Updater, follows a "keep a few recent versions around and just symlink the current one" model to enable atomic upgrades and rollbacks of failed upgrades. If Android Chrome manages its own updates, it's likely using Omaha for them.
65Mb app
22Mb data
= 87Mb total
Cache is recorded separately, currently at 205Mb. I wonder if it is a question of how the figures are being displayed in different versions of Android.