| Index: mojo/devtools/common/README.md
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| diff --git a/mojo/devtools/common/README.md b/mojo/devtools/common/README.md
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| index 5367352596c2462b41e3b66682e4a2fc7e8ee92f..e6044b238e962bbba77b11bb61f55a396413d47c 100644
|
| --- a/mojo/devtools/common/README.md
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| +++ b/mojo/devtools/common/README.md
|
| @@ -57,9 +57,16 @@ manager. You can pass a different window manager url using the
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| performance traces and attach a gdb debugger.
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|
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| #### Tracing
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| -To collect [performance
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| +In order to collect [performance
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| traces](https://www.chromium.org/developers/how-tos/trace-event-profiling-tool)
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| -and retrieve the result:
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| +interactively through `mojo_debug`, make sure that the app being inspected was
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| +run with `--debugger` switch. E.g.:
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| +
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| +```sh
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| +mojo_run --debugger APP_URL [--android]
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| +```
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| +
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| +Then, in another shell, tracing can be orchestrated as follows:
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|
|
| ```sh
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| mojo_debug tracing start
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|
|