[RNMobile] Expose WebView prop.onLoadEnd to Sandbox

[jhnstn]

What?

• Expose the WebView onLoadEnd prop to the SandBox component

Why?

To allow components to register callbacks to the WebView onLoadEnd event.

How?

Testing Instructions

Apply this patch

diff --git a/packages/block-library/src/embed/embed-preview.native.js b/packages/block-library/src/embed/embed-preview.native.js
index 87abc38348..7d000b3e08 100644
--- a/packages/block-library/src/embed/embed-preview.native.js
+++ b/packages/block-library/src/embed/embed-preview.native.js
@@ -116,6 +116,9 @@ const EmbedPreview = ( {
 						providerUrl={ providerUrl }
 						url={ url }
 						containerStyle={ sandboxAlignStyle }
+						onLoadEnd={ () => {
+							console.log( 'embed on load end' );
+						} }
 					/>
 				</View>
 			</TouchableWithoutFeedback>

• Add a non WP embed block to a post e.g. Twitter or Instagram
• Note the debug message in the console when the embed loads

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions]

Size Change: 0 B

Total Size: 1.37 MB

ℹ️ View Unchanged

Filename	Size
build/a11y/index.min.js	993 B
build/annotations/index.min.js	2.78 kB
build/api-fetch/index.min.js	2.33 kB
build/autop/index.min.js	2.15 kB
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build/block-directory/style-rtl.css	1.05 kB
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build/block-editor/default-editor-styles.css	403 B
build/block-editor/index.min.js	202 kB
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build/block-library/blocks/archives/editor.css	60 B
build/block-library/blocks/archives/style-rtl.css	90 B
build/block-library/blocks/archives/style.css	90 B
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build/block-library/blocks/audio/editor.css	150 B
build/block-library/blocks/audio/style-rtl.css	122 B
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build/block-library/blocks/audio/theme-rtl.css	138 B
build/block-library/blocks/audio/theme.css	138 B
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build/block-library/blocks/avatar/style-rtl.css	91 B
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build/block-library/blocks/code/editor.css	53 B
build/block-library/blocks/code/style-rtl.css	121 B
build/block-library/blocks/code/style.css	121 B
build/block-library/blocks/code/theme-rtl.css	124 B
build/block-library/blocks/code/theme.css	124 B
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build/block-library/blocks/columns/editor.css	108 B
build/block-library/blocks/columns/style-rtl.css	409 B
build/block-library/blocks/columns/style.css	409 B
build/block-library/blocks/comment-author-avatar/editor-rtl.css	125 B
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build/block-library/blocks/comment-template/style.css	198 B
build/block-library/blocks/comments-pagination-numbers/editor-rtl.css	123 B
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build/block-library/blocks/details/style.css	54 B
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build/block-library/blocks/embed/editor.css	293 B
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build/block-library/blocks/embed/style.css	410 B
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build/block-library/blocks/embed/theme.css	138 B
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build/block-library/blocks/file/style.css	270 B
build/block-library/blocks/file/view.min.js	353 B
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build/block-library/blocks/media-text/style-rtl.css	507 B
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build/block-library/blocks/more/editor-rtl.css	431 B
build/block-library/blocks/more/editor.css	431 B
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build/block-library/blocks/navigation-link/style.css	115 B
build/block-library/blocks/navigation-submenu/editor-rtl.css	299 B
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build/block-library/blocks/navigation/style-rtl.css	2.22 kB
build/block-library/blocks/navigation/style.css	2.21 kB
build/block-library/blocks/navigation/view-modal.min.js	2.81 kB
build/block-library/blocks/navigation/view.min.js	447 B
build/block-library/blocks/nextpage/editor-rtl.css	395 B
build/block-library/blocks/nextpage/editor.css	395 B
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build/block-library/blocks/page-list/style.css	175 B
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build/block-library/blocks/post-featured-image/style-rtl.css	322 B
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build/block-library/blocks/post-terms/style-rtl.css	96 B
build/block-library/blocks/post-terms/style.css	96 B
build/block-library/blocks/post-time-to-read/style-rtl.css	69 B
build/block-library/blocks/post-time-to-read/style.css	69 B
build/block-library/blocks/post-title/style-rtl.css	100 B
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build/block-library/blocks/preformatted/style.css	103 B
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build/block-library/blocks/pullquote/style.css	335 B
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build/block-library/blocks/pullquote/theme.css	167 B
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build/block-library/blocks/query-pagination/editor-rtl.css	221 B
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build/block-library/blocks/query-title/style.css	63 B
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build/block-library/blocks/search/theme-rtl.css	114 B
build/block-library/blocks/search/theme.css	114 B
build/block-library/blocks/separator/editor-rtl.css	146 B
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build/block-library/blocks/separator/theme.css	194 B
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_{compressed-size-action}

[fluiddot]

LGTM 🎊 !