Extensions Docs Server: Fix headings with no IDs

chrome/common/extensions/docs/templates/articles/app_identity.html

 <h1>Identify User</h1>
 
 
 <p>
 Web authentication protocols utilize HTTP features,
 but packaged apps run inside the app container;
 they don’t load over HTTP and can’t perform redirects or set cookies.
 </p>
 
 <p>
@@ skipping 40 matching lines @@
 </p>
 
 <ol>
         <li>Add permissions to your manifest and upload your app.</li>
         <li>Copy key in the installed <code>manifest.json</code> to your source manifest.</li>
         <li>Get your client ID.</li>
         <li>Update your manifest to include the client ID and scopes.</li>
         <li>Get the authentication token.</li>
 </ol>
 
-<h3>Add permissions and upload app</h3>
+<h3 id="add">Add permissions and upload app</h3>
 
 <p>
 The identity API is still experimental.
 You need to make sure the experimental
 and identity permissions are in your manifest.
 You can then upload your app to the apps and extensions management page
 (see <a href="publish_app.html">Publish</a>).
 </p>
 
 <pre>
 "permissions": [
   "experimental",
   "identity"
  ]
 </pre>
 
-<h3>Copy key to your manifest</h3>
+<h3 id="copy">Copy key to your manifest</h3>
 
 <p>
 You need to copy the key in the installed
 <code>manifest.json</code> to your source manifest.
 This ensures that the key isn't overridden anytime your reload your app
 or share the app with other users.
 It's not the most graceful task, but here's how it goes:
 </p>
 
 <ol>
         <li>Go to your
                 <a href="http://www.chromium.org/user-experience/user-data-directory">user data directory</a>.
                 Example on MacOs: <code>~/Library/Application\ Support/Google/Chrome/Default/Extensions</code></li>
         <li>List the installed apps and extensions and match your app ID on the apps and extensions management page
                 to the same ID here.</li>
         <li>Go to the installed app directory (this will be a version within the app ID).
                 Open the installed <code>manifest.json</code>
                 (pico is a quick way to open the file).</li>
         <li>Copy the "key" in the installed <code>manifest.json</code> and paste it into your app's source manifest file.</li>
 </ol>
 
-<h3>Get your client ID</h3>
+<h3 id="client_id">Get your client ID</h3>
 
 <p>
 Setting up the client ID is currently not available externally
 via <a href="https://devconsole-canary.corp.google.com/apis/">Google APIs Console</a>.
 So to setup the OAuth2 client ID,
 email <a href="mailto:chrome-apps-auth-requests@google.com">chrome-apps-auth-request@google.com</a>
 with your stable app ID and
 we will reply appropriately with your OAuth2 client ID.
 </p>
 
-<h3>Update your manifest</h3>
+<h3 id="update">Update your manifest</h3>
 
 <p>
 You need to update your manifest to include
 the client ID and scopes.
 Here's the sample "oauth2" for the
 <a href="https://github.com/GoogleChrome/chrome-app-samples/tree/master/gdocs">gdocs sample</a>:
 </p>
 
 <pre>
 "oauth2": {
     "client_id": "665859454684.apps.googleusercontent.com",
     "scopes": [
       "https://docs.google.com/feeds/",
       "https://docs.googleusercontent.com/",
       "https://spreadsheets.google.com/feeds/",
       "https://www.googleapis.com/auth/drive.file"
     ]
   }
 </pre>
 
-<h3>Get the token</h3>
+<h3 id="token">Get the token</h3>
 
 <p>
 You are now ready to get the auth token:
 </p>
 
 <pre>
 chrome.experimental.identity.getAuthToken(function(token) { })
 </pre>
 
 <h2 id="non">Non-Google account authentication</h2>
 
 <p>
 Here are the three steps you need to complete:
 </p>
 
 <ol>
         <li>Register with the provider.</li>
         <li>Add permissions for provider resources that your app will access.</li>
         <li>Get the authentication token.</li>
 </ol>
 
-<h3>Register with the provider</h3>
+<h3 id="register">Register with the provider</h3>
 
 <p>
 You need to register an OAuth2 client ID with the provider
 and configure the client ID as a website.
 For the  redirect URI to be entered during registration,
 use the URL of the form:
 <code>https://<extension-id>.chromiumapp.org/<anything-here></code>
 </p>
 
 <p>
 For example, if you app ID is abcdefghijklmnopqrstuvwxyzabcdef and
 you want provider_cb to be the path,
 to distinguish it with redirect URIs from other providers,
 you should use:
 <code>https://abcdefghijklmnopqrstuvwxyzabcdef.chromiumapp.org/provider_cb</code>
 </p>
 
-<h3>Add permissions for provider</h3>
+<h3 id="provider">Add permissions for provider</h3>
 
 <p>
 To make cross-original XHRs to Google API endpoints,
 you need to whitelist those patterns in the permissions:
 </p>
 
 <pre>
 "permissions": [
   ...
   "https://docs.google.com/feeds/",
   "https://docs.googleusercontent.com/",
   “https://www.website-of-provider-with-user-photos.com/photos/”
 ]
 </pre>
 
-<h3>Get the token</h3>
+<h3 id="token2">Get the token</h3>
 
 <p>
 To get the token:
 </p>
 
 <pre>
 chrome.experimental.identity.launchWebAuthFlow(
   {‘url’: ‘&lt;url-to-do-auth>’, ‘interactive’: true},
   function(redirect_url) { // Extract token from redirect_url });
 </pre>
@@ skipping 12 matching lines @@
 It will then redirect to
 <code>https://abcdefghijklmnopqrstuvwxyzabcdef.chromiumapp.org/provider_cb#authToken=&lt;auth-token></code>
 </p>
 
 <p>
 Chrome will capture that and invoke the callback
 of the app with the full redirect URL.
 The app should extract the token out of the URL.
 </p>
 
-<h3>Interactive versus silent mode</h3>
+<h3 id="interactive">Interactive versus silent mode</h3>
 
 <p>
 When calling <code>launchWebAuthFlow</code>,
 you can pass a flag (‘interactive’: true in the example above)
 indicating whether you want the API to be called
 in interactive mode or not (aka silent mode).
 If you invoke the API in interactive mode,
 the user is shown UI, if necessary,
 to get the token (signin UI and/or approval UI;
 or for that matter any provider specific UI).
 </p>
 
 <p>
 If you invoke the API in silent mode,
 the API will only return a token if the provider is able
 to provide a token without showing any UI.
 This is useful in cases when an app is doing the flow at app startup, for example,
 or in general in cases where there is no user gesture involved.
 </p>
 
 <p>
 The best practice we suggest is to use silent mode
 when there is no user gesture involved and use interactive mode
 if there is a user gesture (for example, the user clicked the Sign In button in your app).
 Note that we do not enforce gesture requirement.
 </p>
 
-<p class="backtotop"><a href="#top">Back to top</a></p>
+<p class="backtotop"><a href="#top">Back to top</a></p>