Add sample extension to allow/block third-party cookies.

chrome/common/extensions/docs/samples.json

Index: chrome/common/extensions/docs/samples.json
diff --git a/chrome/common/extensions/docs/samples.json b/chrome/common/extensions/docs/samples.json
index fa7a9cb9eeab133172014fc66ba15cff8971febd..4217e674a7d0a3356e00491e9095784eaecf06e9 100644
--- a/chrome/common/extensions/docs/samples.json
+++ b/chrome/common/extensions/docs/samples.json
@@ -351,6 +351,30 @@
     },
     {
       "api_calls": [
+        "chrome.extension.isAllowedIncognitoAccess"
+      ],
+      "description": "Sample extension which demonstrates how to access a preference.",
+      "features": [
+        "browser_action",
+        "contentSettings",
+        "experimental",
+        "popup"
+      ],
+      "icon": null,
+      "id": "7da105f28e200d42510aff3591dfa5aeb0b82605",
+      "name": "Block\/allow third-party cookies API example extension",
+      "path": "examples\/api\/preferences\/allowThirdPartyCookies\/",
+      "protocols": [],
+      "search_string": "BLOCK\/ALLOW THIRD-PARTY COOKIES API EXAMPLE EXTENSION SAMPLE EXTENSION WHICH DEMONSTRATES HOW TO ACCESS A PREFERENCE. BROWSER_ACTION CONTENTSETTINGS EXPERIMENTAL POPUP CHROME.EXTENSION.ISALLOWEDINCOGNITOACCESS",
+      "source_files": [
+        "manifest.json",
+        "popup.html"
+      ],
+      "source_hash": "0a5411c5d06a2b40b27ce8eef706b0003bb72be8",
+      "zip_path": "examples\/api\/preferences\/allowThirdPartyCookies.zip"
+    },
+    {
+      "api_calls": [
         "chrome.experimental.devtools.audits.addCategory",
         "chrome.extension.onRequest",
         "chrome.extension.sendRequest",
@@ -706,7 +730,7 @@
         "manifest.json",
         "popup.html"
       ],
-      "source_hash": "2919c196fec8721c240b529b7763c36f7330d986",
+      "source_hash": "3b492332455095ce069e29d9dcff81e429459190",
       "zip_path": "examples\/api\/preferences\/enableReferrer.zip"
     },
     {