Edit: This doesn’t seem to be an issue anymore in the Public Beta. Let me know if you still have Chrome crashing all the time!
Google Chrome Canary is usually pretty good in any OS, almost good enough for a daily driver except for the odd crash now and then, but in OS X 10.10 it is not stable at all. Every second or even every tab I open crashes after a period of time, or just straight up will not load. I googled around and found that the solution is partially caused by having to show scrollbars on using the trackpad on MacBooks. You can fix this by running these two commands:
defaults write com.google.Chrome AppleShowScrollBars Always
defaults write com.google.Chrome.canary AppleShowScrollBars Always