17753 [fuchsia] Enable raster cache on Fuchsia (cla: yes, perf: speed, severe: performance)

17914 Fix child caching in opacity_layer (cla: yes, perf: speed, severe: performance)

18006 [fuchsia] set vsync_offset based on config file (cla: yes, severe: performance)

18087 [profiling] CPU Profiling support for iOS (cla: yes, severe: performance)

18132 Revert again “Remove layer integral offset snapping” (cla: yes, perf: speed, severe: performance, waiting for tree to go green)

18164 Fix iOS platform view not deallocated (cla: yes, perf: memory, severe: performance)

18225 Setup default font manager after engine created, to improve startup performance (cla: yes, perf: speed, severe: performance, waiting for tree to go green)