layers: Improve Fragment Density Map Offset messages #10877

Job	Run time
code-format	26s
check_vvl	1m 24s
chromium (target_os="linux" target_cpu="x64")	8m 2s
linux (address sanitizer, release, robinhood ON )	22m 0s
androidOnLinux	4m 54s
chromium (target_os="android" target_cpu="arm64")	11m 51s
linux (address sanitizer, release, robinhood OFF )	23m 36s
android (arm64-v8a, ON, c++_shared)	9m 2s
android (armeabi-v7a, OFF, c++_static)	4m 43s
Ubuntu Backcompat	4m 33s
linux (Build Only, debug, robinhood ON )	11m 27s
linux (thread sanitizer, release, robinhood ON )	7m 57s
mingw	4m 30s
windows (amd64)	16m 4s
windows (amd64_x86)	15m 18s
iOS	4m 18s
androidUpload	2m 6s
windowsUpload	21m 44s
linux Upload	5m 57s
	2h 59m 52s

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