The comment you replied to was: "The only good products Google has ever built in-house are [...]"
I don't have enough information to judge how much of Chrome was original work and how much was pre-existing work. Though I guess by now, after nearly 20 years, Chrome's codebase looks absolutely nothing like KHTML.
Google Chrome didn't start from scratch. Blink came from WebKit which came from KDE's KHTML. https://en.wikipedia.org/wiki/Blink_(browser_engine) , https://en.wikipedia.org/wiki/WebKit , https://en.wikipedia.org/wiki/KHTML
Entirely irrelevant - Chrome really stepped up both security and speed over WebKit at that time.
The comment you replied to was: "The only good products Google has ever built in-house are [...]"
I don't have enough information to judge how much of Chrome was original work and how much was pre-existing work. Though I guess by now, after nearly 20 years, Chrome's codebase looks absolutely nothing like KHTML.