Bluetooth: add Device events, and cleanup JS API

chrome/docs/platform-pillar.html

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   <h1>Chrome Platform</h1>
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   <section class="article-list g-section">
     <article class="new">
     <h4 class="label">Apps</h4>
     <h2>Learn Basics</h2>
     <p>Develop your first Chrome App and discover
     how they look, how they behave, and how they are modeled.
     Launch your Apps from your native platform
     using the
     <a href="http://chrome.blogspot.com/2013/12/a-new-breed-of-chrome-apps-now.html">Chrome App Launcher</a>:
     </p>
     <p><a href="/apps/first_app.html">Learn more</a></p>
     <img src="{{static}}/images/platform-pillar/chrome_apps.png" alt="500px Chrome App launched from Chrome App Launcher">
     </article>
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     <article>
     <h4 class="label">Apps</h4>
     <h2>Learn with Codelab</h2>
     <p>The goal of this codelab is to get you building Chrome Apps fast.
     Once you've completed this codelab, you will have a simple Todo app.</p>
     <p><a href="/apps/app_codelab1_setup.html">Learn more</a></p>
     <img src="{{static}}/images/platform-pillar/todo_codelab.png"
          width="110%"
          alt="Create this simple Todo Chrome App.">
     </article>
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     <article>
     <h4 class="label">Apps</h4>
     <h2>Network and Hardware APIs</h2>
     <p> Chrome Apps can interact with low-level system services.
     Using the network and hardware APIs, they can:
     <ul>
       <li>Act as <a href="/apps/socket.html">network clients</a>
 for TCP and UDP connections.</li>
-      <li>Communicate with <a href="/apps/usb.html">usb devices</a>.</li>
+      <li>Communicate with <a href="/apps/app_usb.html">usb devices</a>.</li>
       <li>Read and write to devices connected to <a href="/apps/serial.html">serial ports</a>.</li>
-      <li>Connect to <a href="/apps/bluetooth.html">bluetooth devices</a>.</li>
+      <li>Connect to <a href="/apps/app_bluetooth.html">bluetooth devices</a>.</li>
     </ul></p>
-    <p><a href="/apps/app_usb.html">Learn more</a></p>
     </article>
 
     <article>
     <h4 class="label">Extensions</h4>
     <h2>Learn Basics</h2>
     <p>Extensions are small software programs that can modify and
     enhance the functionality of the Chrome browser.
     Write extensions using web technologies: HTML, JavaScript, and CSS.</p>
     <p><a href="/extensions/overview.html">Learn more</a></p>
     <img src="{{static}}/images/platform-pillar/extensions.png" alt="Browser action and page actions are common extension types.">
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     <h4 class="label">Extensions</h4>
     <h2>Distribute Extensions</h2>
     <p><a href="/extensions/packaging.html">Upload your extension</a>
     to test it in developer channels,
     then <a href="/extensions/hosting.html">publish your extension</a>
     in the Chrome Web Store.
     New feature! You can now
     <a href="/webstore/payments-otp">monetize your extensions</a>!</p>
     <p><a href="/extensions/hosting.html">Learn more</a></p>
     <img src="{{static}}/images/platform-pillar/upload_extensions.png" alt="Upload extensions on chrome://extensions page.">
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     <article>
     <h4 class="label">Extensions</h4>
     <h2>Themes</h2>
     <p>A theme is a special kind of extension that changes the way the browser looks.
     Themes are <a href="/extensions/packaging.html">packaged</a> like regular extensions,
     but they don't contain JavaScript or HTML code.
     Distribute your themes in the
     <a href="https://chrome.google.com/webstore/category/themes">Chrome Web Store</a>.
     </p>
     <p><a href="/extensions/themes.html">Learn more</a></p>
     <img src="{{static}}/images/platform-pillar/theme.png" alt="Grass theme">
     </article>
 
     <article class="new">
     <h4 class="label">Native Client</h4>
     <h2>Learn Basics</h2>
     <p>Native Client is a sandbox for running compiled C and C++ code in the browser.
     Portable Native Client extends that technology with architecture independence,
     letting developers compile their code once to run in any website and on any architecture.</p>
     <p><a href="/native-client/index.html">Learn more</a></p>
     <img src="{{static}}/images/platform-pillar/pnacl_intro.png" alt="Watch a live recorded conversation on Native Client.">
     </article>
 
     <article>
     <h4 class="label">Native Client</h4>
     <h2>Tutorial</h2>
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     <p>This multi-part tutorial explains how to get started developing applications with Native Client.</p>
 
     <p><a href="/native-client/devguide/tutorial/tutorial-part1">Part one</a>
     shows how to build and run a simple web application
     using Portable Native Client (PNaCl).</p>
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     <p><a href="/native-client/devguide/tutorial/tutorial-part2">Part two</a>
     shows how to convert the finished PNaCl web application
     to use the Native Client SDK build system and common JavaScript files.
     </p>
     <p><a href="/native-client/devguide/tutorial/tutorial-part1">Learn more</a></p>
     </article>
 
     <article>
     <h4 class="label">Native Client</h4>
     <h2>SDK</h2>
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     Learn:
     <ul>
     <li>How Native Client applications are
     <a href="/native-client/devguide/coding/application-structure.html">structured</a></li>
     <li>Which classes and functions to implement in your
 <a href="/native-client/devguide/coding/native-client-modules.html">Native Client module</a> for Chrome to load, initialize, and run it</li>
     <li>How to use the
     <a href="/native-client/devguide/coding/message-system.html">messaging system</a>
     to communicate between the JavaScript code and
     the Native Client module's C or C++code</li>
-    </ul>    
+    </ul>
     And much more!</p>
     <p><a href="/native-client/devguide/coding/application-structure.html">Learn more</a></p>
     </article>
 
     <article>
     <h4 class="label">Native Client</h4>
     <h2>Pepper API</h2>
     <p>The Pepper API lets Native Client modules communicate
     with the hosting browser and access system-level functions in a safe and portable way.
     Pepper has both a
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           <h2 class="puzzle">Join a Group</h2>
           <p>Help us make the Chrome Platform better!
           Join a Chrome Platform group:
           <ul>
           <li><a href="https://groups.google.com/a/chromium.org/forum/#!forum/chromium-apps">Chrome Apps</a></li>
           <li><a href="https://groups.google.com/a/chromium.org/forum/#!forum/chromium-extensions">Chrome Extensions</a></li>
           <li><a href="https://groups.google.com/forum/#!forum/native-client-discuss">Native Client</a></li>
           </ul>
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           </article>
         </div>
       </div>
     </div>
   </section>
 
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