Block editor iframe: cache object URL

[ellatrix]

What?

@dmsnell Do you think this makes a difference?

 * Normally, all iframes on the page use the exact same initial HTML, so we can
 * cache creating the object URL once for all iframes (think patterns and
 * previews). If the initial HTML changes, it will change for all iframes (which
 * would also reload the iframe).
 *
 * The hope is that this this reduces memory usage and maybe also taps into some
 * browser caching.

To test: verify that all frames on the page have the same src.

Why?

How?

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions]

Size Change: -1 B (0%)

Total Size: 1.51 MB

Filename	Size	Change
build/block-editor/index.min.js	213 kB	-1 B (0%)

ℹ️ View Unchanged

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_{compressed-size-action}

[dmsnell]

seems legit @ellatrix

I believe that the BLOB store is just another key/value store inside the session. in fact, if we expect most iframes to start with the initial same HTML, we could even examine storing the first HTML that this function gets and then caching the last-given value separately. don't know if that would make sense, but instead of holding onto one value we could hold onto two if we expect that the very first one will come up over and over again.