Add getDefaultFontSize and setDefaultFontSize to Font Settings Extension 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 84 matching lines @@
     "chrome.experimental.devtools.audits.AuditResults.createResult": "experimental.devtools.audits.html#method-AuditResults-createResult",
     "chrome.experimental.devtools.audits.AuditResults.createSnippet": "experimental.devtools.audits.html#method-AuditResults-createSnippet",
     "chrome.experimental.devtools.audits.AuditResults.createURL": "experimental.devtools.audits.html#method-AuditResults-createURL",
     "chrome.experimental.devtools.audits.AuditResults.done": "experimental.devtools.audits.html#method-AuditResults-done",
     "chrome.experimental.devtools.audits.addCategory": "experimental.devtools.audits.html#method-addCategory",
     "chrome.experimental.devtools.console.addMessage": "experimental.devtools.console.html#method-addMessage",
     "chrome.experimental.devtools.console.getMessages": "experimental.devtools.console.html#method-getMessages",
     "chrome.experimental.devtools.console.onMessageAdded": "experimental.devtools.console.html#event-onMessageAdded",
     "chrome.experimental.downloads.download": "experimental.downloads.html#method-download",
     "chrome.experimental.extension.onInstalled": "experimental.extension.html#event-onInstalled",
+    "chrome.experimental.fontSettings.getDefaultFontSize": "experimental.fontSettings.html#method-getDefaultFontSize",
     "chrome.experimental.fontSettings.getFontList": "experimental.fontSettings.html#method-getFontList",
     "chrome.experimental.fontSettings.getFontName": "experimental.fontSettings.html#method-getFontName",
+    "chrome.experimental.fontSettings.setDefaultFontSize": "experimental.fontSettings.html#method-setDefaultFontSize",
     "chrome.experimental.fontSettings.setFontName": "experimental.fontSettings.html#method-setFontName",
     "chrome.experimental.infobars.show": "experimental.infobars.html#method-show",
     "chrome.experimental.keybinding.onCommand": "experimental.keybinding.html#event-onCommand",
     "chrome.experimental.managedMode.enter": "experimental.managedMode.html#method-enter",
     "chrome.experimental.managedMode.get": "experimental.managedMode.html#method-get",
     "chrome.experimental.offscreenTabs.create": "experimental.offscreenTabs.html#method-create",
     "chrome.experimental.offscreenTabs.get": "experimental.offscreenTabs.html#method-get",
     "chrome.experimental.offscreenTabs.getAll": "experimental.offscreenTabs.html#method-getAll",
     "chrome.experimental.offscreenTabs.onUpdated": "experimental.offscreenTabs.html#event-onUpdated",
     "chrome.experimental.offscreenTabs.remove": "experimental.offscreenTabs.html#method-remove",
@@ skipping 917 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.getDefaultFontSize",
         "chrome.experimental.fontSettings.getFontList",
         "chrome.experimental.fontSettings.getFontName",
+        "chrome.experimental.fontSettings.setDefaultFontSize",
         "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",
+      "search_string": "FONT SETTINGS SAMPLE EXTENSION FOR FONT SETTINGS API BROWSER_ACTION EXPERIMENTAL POPUP CHROME.EXPERIMENTAL.FONTSETTINGS.GETDEFAULTFONTSIZE CHROME.EXPERIMENTAL.FONTSETTINGS.GETFONTLIST CHROME.EXPERIMENTAL.FONTSETTINGS.GETFONTNAME CHROME.EXPERIMENTAL.FONTSETTINGS.SETDEFAULTFONTSIZE CHROME.EXPERIMENTAL.FONTSETTINGS.SETFONTNAME",
       "source_files": [
         "manifest.json",
         "popup.html",
         "popup.js"
       ],
-      "source_hash": "8d5bfbc7f8578f6a0f70602cc5e360f1c6138588",
+      "source_hash": "b5febada226fcd2d38461121c039c55ebcb3decf",
       "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",
@@ skipping 1490 matching lines @@
         "manifest.json",
         "popup.html",
         "popup.js",
         "sample.css"
       ],
       "source_hash": "8e51dc3a9577065d22ce92f3c838edc5ceaf4e65",
       "zip_path": "examples\/api\/extension\/isAllowedAccess.zip"
     }
   ]
 }