Add example extension using Font Settings API.

chrome/common/extensions/docs/samples.json

 {
   "api": {
     "chrome.bookmarks.create": "bookmarks.html#method-create",
     "chrome.bookmarks.get": "bookmarks.html#method-get",
     "chrome.bookmarks.getChildren": "bookmarks.html#method-getChildren",
     "chrome.bookmarks.getRecent": "bookmarks.html#method-getRecent",
     "chrome.bookmarks.getSubTree": "bookmarks.html#method-getSubTree",
     "chrome.bookmarks.getTree": "bookmarks.html#method-getTree",
     "chrome.bookmarks.move": "bookmarks.html#method-move",
     "chrome.bookmarks.onChanged": "bookmarks.html#event-onChanged",
@@ skipping 964 matching lines @@
         "background.js",
         "devtools.html",
         "devtools.js",
         "manifest.json"
       ],
       "source_hash": "0ced0f45a4369316e2f4402bdf9c85451be864b1",
       "zip_path": "examples\/api\/devtools\/network\/chrome-firephp.zip"
     },
     {
       "api_calls": [
+        "chrome.experimental.fontSettings.getFontList",
+        "chrome.experimental.fontSettings.getFontName",
+        "chrome.experimental.fontSettings.setFontName"
+      ],
+      "crx_path": null,
+      "description": "Sample extension for Font Settings API",
+      "features": [
+        "browser_action",
+        "experimental",
+        "popup"
+      ],
+      "icon": "fonts128.png",
+      "id": "31d10fd5e61ca51eb59073b358d4ab5267cbf318",
+      "name": "Font Settings",
+      "packaged_app": false,
+      "path": "examples\/api\/fontSettings\/",
+      "protocols": [],
+      "search_string": "FONT SETTINGS SAMPLE EXTENSION FOR FONT SETTINGS API BROWSER_ACTION EXPERIMENTAL POPUP CHROME.EXPERIMENTAL.FONTSETTINGS.GETFONTLIST CHROME.EXPERIMENTAL.FONTSETTINGS.GETFONTNAME CHROME.EXPERIMENTAL.FONTSETTINGS.SETFONTNAME",
+      "source_files": [
+        "manifest.json",
+        "popup.html",
+        "popup.js"
+      ],
+      "source_hash": "42748a86c686a58b7c6b11259bb52c75e4bb5bc7",
+      "zip_path": "examples\/api\/fontSettings.zip"
+    },
+    {
+      "api_calls": [
         "chrome.browserAction.onClicked",
         "chrome.browserAction.setBadgeBackgroundColor",
         "chrome.browserAction.setBadgeText",
         "chrome.browserAction.setIcon",
         "chrome.browserAction.setTitle",
         "chrome.extension.getBackgroundPage",
         "chrome.extension.onRequest",
         "chrome.extension.sendRequest",
         "chrome.i18n.getMessage",
         "chrome.tabs.create",
@@ skipping 1485 matching lines @@
         "manifest.json",
         "popup.html",
         "popup.js",
         "sample.css"
       ],
       "source_hash": "8e51dc3a9577065d22ce92f3c838edc5ceaf4e65",
       "zip_path": "examples\/api\/extension\/isAllowedAccess.zip"
     }
   ]
 }