Add the about_page key to shared_module manifest

chrome/common/extensions/manifest_tests/extension_manifests_about_unittest.cc

Index: chrome/common/extensions/manifest_tests/extension_manifests_about_unittest.cc
diff --git a/chrome/common/extensions/manifest_tests/extension_manifests_about_unittest.cc b/chrome/common/extensions/manifest_tests/extension_manifests_about_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5911fef39a63187597d3fba41ee6dc975beae844
--- /dev/null
+++ b/chrome/common/extensions/manifest_tests/extension_manifests_about_unittest.cc
@@ -0,0 +1,29 @@
+// Copyright (c) 2012 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.
+
+#include "chrome/common/extensions/manifest_tests/extension_manifest_test.h"
+#include "chrome/common/extensions/manifest_url_handler.h"
+#include "extensions/common/manifest_constants.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace errors = extensions::manifest_errors;
+
+class AboutPageManifestTest : public ExtensionManifestTest {};
+
+TEST_F(AboutPageManifestTest, AboutPageInSharedModules) {
+  scoped_refptr<extensions::Extension> extension;
+  extension = LoadAndExpectSuccess("shared_module_about.json");
+  EXPECT_EQ(GURL("chrome-extension://" + extension->id() + "/about.html"),
+            extensions::ManifestURL::GetAboutPage(extension.get()));
+
+  Testcase testcases[] = {
+      // Forbid data types other than strings.
+      Testcase("shared_module_about_invalid_type.json",
+               errors::kInvalidAboutPage),
+
+      // Forbid absolute URLs.
+      Testcase("shared_module_about_absolute.json",
+               errors::kInvalidAboutPageExpectRelativePath)};
+  RunTestcases(testcases, arraysize(testcases), EXPECT_TYPE_ERROR);
+}