It's mostly historical reasons, and that they gain relatively little from merging them, but it costs a lot. No one in Google3 depends on Chrome or Android sourc

It's mostly historical reasons, and that they gain relatively little from merging them, but it costs a lot. No one in Google3 depends on Chrome or Android source, and nothing in the Chrome or AOSP projects depends on Google3. Android and chrome are both on weird git systems, and that doesn't work well in Google3. There'd be a huge amount of work to merge them, and for what...exactly?