Caused by “Optimize HTML parser for speed instead of size on Android.”

Commit: b9fddd03657a4b15506833bf7678a51785094dc7

Link to size graph: https://chromeperf.appspot.com/report?sid=a097e74b1aa288511afb4cb616efe0f95ba4d347ad61d5e835072f23450938ba&num_points=10&rev=518781

Debugging size regressions is documented at: https://chromium.googlesource.com/chromium/src/+/master/docs/speed/apk_size_regressions.md#Debugging-Apk-Size-Increase

Section Sizes (Total=82.2kb (84159 bytes)):     
    .bss: 0 bytes (0 bytes) (not included in totals)                                                                     
    .data: 0 bytes (0 bytes) (0.0%)                   
    .data.rel.ro: 0 bytes (0 bytes) (0.0%)                                                                                                                                       
    .rel.dyn: -8 bytes (-8 bytes) (-0.0%)                                                                                                                                        
    .rodata: 0 bytes (0 bytes) (0.0%)                                                                                                                                            
    .text: 82.2kb (84171 bytes) (100.0%)

It looks to me that the size increase is expected, just these files weren't in android before.
Feel free to close as “Won't Fix” unless you can see some way to reduce size.