Adding `content_security_policy` to a few sample extensions

chrome/common/extensions/docs/examples/api/browserAction/make_page_red/background.js

Index: chrome/common/extensions/docs/examples/api/browserAction/make_page_red/background.js
diff --git a/chrome/common/extensions/docs/examples/api/browserAction/make_page_red/background.js b/chrome/common/extensions/docs/examples/api/browserAction/make_page_red/background.js
new file mode 100644
index 0000000000000000000000000000000000000000..59e3ff8d553609502b5102b0d9d5879d50066421
--- /dev/null
+++ b/chrome/common/extensions/docs/examples/api/browserAction/make_page_red/background.js
@@ -0,0 +1,17 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Called when the user clicks on the browser action.
+chrome.browserAction.onClicked.addListener(function(tab) {
+  chrome.tabs.executeScript(
+      null, {code:"document.body.style.background='red !important'"});
+});
+
+chrome.browserAction.setBadgeBackgroundColor({color:[0, 200, 0, 100]});
+
+var i = 0;
+window.setInterval(function() {
+  chrome.browserAction.setBadgeText({text:String(i)});
+  i++;
+}, 10);