Rust

Add helper function for initializing/updating viewports #140

Job	Run time
android	31s
Format + check + test	39s
Check wasm32 + wasm-bindgen	2m 25s
cargo-deny aarch64-apple-darwin	53s
cargo-deny aarch64-linux-android	45s
Check Windows	1m 46s
cargo-deny i686-pc-windows-gnu	49s
cargo-deny i686-pc-windows-msvc	43s
cargo-deny i686-unknown-linux-gnu	42s
cargo-deny wasm32-unknown-unknown	42s
cargo-deny x86_64-apple-darwin	40s
cargo-deny x86_64-pc-windows-gnu	59s
cargo-deny x86_64-pc-windows-msvc	39s
cargo-deny x86_64-unknown-linux-gnu	39s
cargo-deny x86_64-unknown-linux-musl	40s
cargo-deny x86_64-unknown-redox	53s
	14m 25s

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