Copyright 2013 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
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You can install the Accessibility Developer Tools extension from the Chrome Web Store page.
git clone --recursive https://github.com/GoogleChrome/accessibility-developer-tools-extension.git
Download the Closure compiler jar and put it in ~/src/closure/compiler.jar.
cd accessibility-developer-tools-extension
make
This will run Closure compiler on all the JS sources and place generated outputs in extension.
First, you need to enable the "experimental extension APIs" flag on chrome://flags. This will require restarting Chrome to take effect.
The Chrome extension developer documentation has the instructions for loading an unpacked extension; extension is the the directory containing the manifest, so this should be the directory you load.
Note: if you already have the web store version of Accessibility Developer Tools, you might want to modify the manifest (extension/manifest.json) to display a different name for your local copy. This does not require re-building the project.