Add sample extension that allows setting plugin-specific content settings.

chrome/common/extensions/docs/samples.json

 {
   "api": {
     "chrome.bookmarks.create": "bookmarks.html#method-create",
     "chrome.bookmarks.export": "bookmarks.html#method-export",
     "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.import": "bookmarks.html#method-import",
@@ skipping 1827 matching lines @@
         "options.html",
         "script.js",
         "util\/sorttable.js",
         "util\/table2CSV.js"
       ],
       "source_hash": "a3539096027886df533d42d0762990abdcc38840",
       "zip_path": "examples\/extensions\/benchmark.zip"
     },
     {
       "api_calls": [
+        "chrome.i18n.getMessage"
+      ],
+      "crx_path": null,
+      "description": "Customize your content setting for different plug-ins.",
+      "features": [
+        "contentSettings",
+        "options_page"
+      ],
+      "icon": "bunny128.png",
+      "id": "ab4b9e00a673701b355db9eb8f9ebf2c850cd784",
+      "name": "Per-plugin content settings",
+      "packaged_app": false,
+      "path": "examples\/extensions\/plugin_settings\/",
+      "protocols": [],
+      "search_string": "PER-PLUGIN CONTENT SETTINGS CUSTOMIZE YOUR CONTENT SETTING FOR DIFFERENT PLUG-INS. CONTENTSETTINGS OPTIONS_PAGE CHROME.I18N.GETMESSAGE",
+      "source_files": [
+        "_locales\/en\/messages.json",
+        "css\/plugin_list.css",
+        "css\/rule_list.css",
+        "domui\/css\/button.css",
+        "domui\/css\/chrome_shared.css",
+        "domui\/css\/list.css",
+        "domui\/css\/select.css",
+        "domui\/js\/cr.js",
+        "domui\/js\/cr\/event_target.js",
+        "domui\/js\/cr\/ui.js",
+        "domui\/js\/cr\/ui\/array_data_model.js",
+        "domui\/js\/cr\/ui\/list.js",
+        "domui\/js\/cr\/ui\/list_item.js",
+        "domui\/js\/cr\/ui\/list_selection_controller.js",
+        "domui\/js\/cr\/ui\/list_selection_model.js",
+        "domui\/js\/cr\/ui\/list_single_selection_model.js",
+        "domui\/js\/util.js",
+        "js\/main.js",
+        "js\/plugin_list.js",
+        "js\/plugin_settings.js",
+        "js\/rule_list.js",
+        "manifest.json",
+        "options.html",
+        "options\/css\/list.css",
+        "options\/js\/deletable_item_list.js",
+        "options\/js\/inline_editable_list.js"
+      ],
+      "source_hash": "1e2765f821fa09cf0db9cce20ae61d964565986b",
+      "zip_path": "examples\/extensions\/plugin_settings.zip"
+    },
+    {
+      "api_calls": [
         "chrome.browserAction.onClicked",
         "chrome.tabs.update"
       ],
       "crx_path": null,
       "description": "Adds a print button to the browser.",
       "features": [
         "background_page",
         "browser_action",
         "tabs"
       ],
@@ skipping 567 matching lines @@
         "manifest.json",
         "popup.html",
         "popup.js",
         "sample.css"
       ],
       "source_hash": "62ca453d8d1551ff63dd7c78b49d546bc3af17c6",
       "zip_path": "examples\/api\/extension\/isAllowedAccess.zip"
     }
   ]
 }