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servo/components/layout
bors-servo 3993fde90a Auto merge of #12935 - shinglyu:layout_json, r=glennw
Fixed layout flow tree JSON serialization

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The second argument for the `emit_struct()` is the number of fields, if given `0`, the output JSON will always be empty.

This is used in `./mach run -d -Z trace-layout https://servo.org`, which will dump the layout flow tree into a `layout_trace.json` file for debugging.

This also unblocks https://github.com/servo/servo/issues/12675

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors

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- [x] These changes do not require tests because its a debugging tool, not critical for normal code path

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