Start refractoring extension permissions into ExtensionPermissionSet.

chrome/common/extensions/extension_permission_set_unittest.cc

Index: chrome/common/extensions/extension_permission_set_unittest.cc
diff --git a/chrome/common/extensions/extension_permission_set_unittest.cc b/chrome/common/extensions/extension_permission_set_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..733b2bdc3f9371bb14b0a14d4491387aff47db3e
--- /dev/null
+++ b/chrome/common/extensions/extension_permission_set_unittest.cc
@@ -0,0 +1,762 @@
+// 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.
+
+#include "chrome/common/extensions/extension_permission_set.h"
+
+#include "base/logging.h"
+#include "base/path_service.h"
+#include "base/utf_string_conversions.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/common/extensions/extension.h"
+#include "content/common/json_value_serializer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+static scoped_refptr<Extension> LoadManifest(const std::string& dir,
+                                             const std::string& test_file,
+                                             int extra_flags) {
+  FilePath path;
+  PathService::Get(chrome::DIR_TEST_DATA, &path);
+  path = path.AppendASCII("extensions")
+             .AppendASCII(dir)
+             .AppendASCII(test_file);
+
+  JSONFileValueSerializer serializer(path);
+  std::string error;
+  scoped_ptr<Value> result(serializer.Deserialize(NULL, &error));
+  if (!result.get()) {
+    EXPECT_EQ("", error);
+    return NULL;
+  }
+
+  scoped_refptr<Extension> extension = Extension::Create(
+      path.DirName(), Extension::INVALID,
+      *static_cast<DictionaryValue*>(result.get()),
+      Extension::STRICT_ERROR_CHECKS | extra_flags, &error);
+  EXPECT_TRUE(extension) << error;
+  return extension;
+}
+
+static scoped_refptr<Extension> LoadManifest(const std::string& dir,
+                                             const std::string& test_file) {
+  return LoadManifest(dir, test_file, Extension::NO_FLAGS);
+}
+
+void CompareLists(const std::vector<std::string>& expected,
+                  const std::vector<std::string>& actual) {
+  ASSERT_EQ(expected.size(), actual.size());
+
+  for (size_t i = 0; i < expected.size(); ++i) {
+    EXPECT_EQ(expected[i], actual[i]);
+  }
+}
+
+static void AddPattern(URLPatternSet* extent, const std::string& pattern) {
+  int schemes = URLPattern::SCHEME_ALL;
+  extent->AddPattern(URLPattern(schemes, pattern));
+}
+
+static void AssertEqualExtents(const URLPatternSet& extent1,
+                               const URLPatternSet& extent2) {
+  URLPatternList patterns1 = extent1.patterns();
+  URLPatternList patterns2 = extent2.patterns();
+  std::set<std::string> strings1;
+  EXPECT_EQ(patterns1.size(), patterns2.size());
+
+  for (size_t i = 0; i < patterns1.size(); ++i)
+    strings1.insert(patterns1.at(i).GetAsString());
+
+  std::set<std::string> strings2;
+  for (size_t i = 0; i < patterns2.size(); ++i)
+    strings2.insert(patterns2.at(i).GetAsString());
+
+  EXPECT_EQ(strings1, strings2);
+}
+
+} // namespace
+
+class ExtensionAPIPermissionTest : public testing::Test {
+};
+
+class ExtensionPermissionSetTest : public testing::Test {
+};
+
+// Tests that GetByName works with normal permission names and aliases.
+TEST(ExtensionAPIPermissionTest, GetByName) {
+  EXPECT_EQ(ExtensionAPIPermission::Tab(),
+            *ExtensionAPIPermission::GetByName("tabs"));
+  EXPECT_EQ(ExtensionAPIPermission::Management(),
+            *ExtensionAPIPermission::GetByName("management"));
+  EXPECT_FALSE(ExtensionAPIPermission::GetByName("alsdkfjasldkfj"));
+}
+
+// Tests that the aliases are properly mapped.
+TEST(ExtensionAPIPermissionTest, Aliases) {
+  // tabs: tabs, windows
+  std::string tabs_name = "tabs";
+  EXPECT_EQ(tabs_name, ExtensionAPIPermission::Tab().name());
+  EXPECT_EQ(ExtensionAPIPermission::Tab(),
+            *ExtensionAPIPermission::GetByName("tabs"));
+  EXPECT_EQ(ExtensionAPIPermission::Tab(),
+            *ExtensionAPIPermission::GetByName("windows"));
+
+  // unlimitedStorage: unlimitedStorage, unlimited_storage
+  std::string storage_name = "unlimitedStorage";
+  EXPECT_EQ(storage_name,
+            ExtensionAPIPermission::UnlimitedStorage().name());
+  EXPECT_EQ(ExtensionAPIPermission::UnlimitedStorage(),
+            *ExtensionAPIPermission::GetByName("unlimitedStorage"));
+  EXPECT_EQ(ExtensionAPIPermission::UnlimitedStorage(),
+            *ExtensionAPIPermission::GetByName("unlimited_storage"));
+}
+
+TEST(ExtensionAPIPermissionTest, HostedAppPermissions) {
+  std::set<ExtensionAPIPermission> hosted_perms;
+  hosted_perms.insert(ExtensionAPIPermission::Background());
+  hosted_perms.insert(ExtensionAPIPermission::ClipboardRead());
+  hosted_perms.insert(ExtensionAPIPermission::ClipboardWrite());
+  hosted_perms.insert(ExtensionAPIPermission::ChromePrivate());
+  hosted_perms.insert(ExtensionAPIPermission::Experimental());
+  hosted_perms.insert(ExtensionAPIPermission::Geolocation());
+  hosted_perms.insert(ExtensionAPIPermission::Notification());
+  hosted_perms.insert(ExtensionAPIPermission::UnlimitedStorage());
+  hosted_perms.insert(ExtensionAPIPermission::WebstorePrivate());
+
+  std::set<ExtensionAPIPermission> perms = ExtensionAPIPermission::GetAll();
+  size_t count = 0;
+  for (std::set<ExtensionAPIPermission>::iterator i = perms.begin();
+       i != perms.end(); ++i) {
+    count += hosted_perms.count(*i);
+    EXPECT_EQ(hosted_perms.count(*i), i->is_hosted_app());
+  }
+
+  EXPECT_EQ((size_t)9, count);
+  EXPECT_EQ((size_t)9, ExtensionAPIPermission::hosted_app_permission_count());
+}
+
+TEST(ExtensionAPIPermissionTest, ComponentOnlyPermissions) {
+  std::set<ExtensionAPIPermission> private_perms;
+  private_perms.insert(ExtensionAPIPermission::ChromeosInfoPrivate());
+  private_perms.insert(ExtensionAPIPermission::FileBrowserPrivate());
+  private_perms.insert(ExtensionAPIPermission::MediaPlayerPrivate());
+  private_perms.insert(ExtensionAPIPermission::WebstorePrivate());
+
+  std::set<ExtensionAPIPermission> perms = ExtensionAPIPermission::GetAll();
+  int count = 0;
+  for (std::set<ExtensionAPIPermission>::iterator i = perms.begin();
+       i != perms.end(); ++i) {
+    count += private_perms.count(*i);
+    EXPECT_EQ(private_perms.count(*i), i->is_component_only());
+  }
+
+  EXPECT_EQ(4, count);
+}
+
+TEST(ExtensionPermissionSetTest, EffectiveHostPermissions) {
+  scoped_refptr<Extension> extension;
+  ExtensionPermissionSet permissions;
+
+  extension = LoadManifest("effective_host_permissions", "empty.json");
+  permissions = extension->permission_set();
+  EXPECT_EQ(0u, extension->GetEffectiveHostPermissions().patterns().size());
+  EXPECT_FALSE(permissions.HasAccessToHost(GURL("http://www.google.com")));
+  EXPECT_FALSE(permissions.HasEffectiveAccessToAllHosts());
+
+  extension = LoadManifest("effective_host_permissions", "one_host.json");
+  permissions = extension->permission_set();
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://www.google.com")));
+  EXPECT_FALSE(permissions.HasAccessToHost(GURL("https://www.google.com")));
+  EXPECT_FALSE(permissions.HasEffectiveAccessToAllHosts());
+
+  extension = LoadManifest("effective_host_permissions",
+                           "one_host_wildcard.json");
+  permissions = extension->permission_set();
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://google.com")));
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://foo.google.com")));
+  EXPECT_FALSE(permissions.HasEffectiveAccessToAllHosts());
+
+  extension = LoadManifest("effective_host_permissions", "two_hosts.json");
+  permissions = extension->permission_set();
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://www.google.com")));
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://www.reddit.com")));
+  EXPECT_FALSE(permissions.HasEffectiveAccessToAllHosts());
+
+  extension = LoadManifest("effective_host_permissions",
+                           "https_not_considered.json");
+  permissions = extension->permission_set();
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://google.com")));
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("https://google.com")));
+  EXPECT_FALSE(permissions.HasEffectiveAccessToAllHosts());
+
+  extension = LoadManifest("effective_host_permissions",
+                           "two_content_scripts.json");
+  permissions = extension->permission_set();
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://google.com")));
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://www.reddit.com")));
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://news.ycombinator.com")));
+  EXPECT_FALSE(permissions.HasEffectiveAccessToAllHosts());
+
+  extension = LoadManifest("effective_host_permissions", "all_hosts.json");
+  permissions = extension->permission_set();
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://test/")));
+  EXPECT_FALSE(permissions.HasAccessToHost(GURL("https://test/")));
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://www.google.com")));
+  EXPECT_TRUE(permissions.HasEffectiveAccessToAllHosts());
+
+  extension = LoadManifest("effective_host_permissions", "all_hosts2.json");
+  permissions = extension->permission_set();
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://test/")));
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://www.google.com")));
+  EXPECT_TRUE(permissions.HasEffectiveAccessToAllHosts());
+
+  extension = LoadManifest("effective_host_permissions", "all_hosts3.json");
+  permissions = extension->permission_set();
+  EXPECT_FALSE(permissions.HasAccessToHost(GURL("http://test/")));
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("https://test/")));
+  EXPECT_TRUE(permissions.HasAccessToHost(GURL("http://www.google.com")));
+  EXPECT_TRUE(permissions.HasEffectiveAccessToAllHosts());
+}
+
+TEST(ExtensionPermissionSetTest, CreateUnion) {
+  std::set<ExtensionAPIPermission> apis1;
+  std::set<ExtensionAPIPermission> apis2;
+  std::set<ExtensionAPIPermission> expected_apis;
+
+  URLPatternSet hosts1;
+  URLPatternSet hosts2;
+  URLPatternSet expected_hosts;
+
+  bool native_code1 = false;
+  bool native_code2 = false;
+  bool expected_native_code = false;
+
+  scoped_ptr<ExtensionPermissionSet> set1;
+  scoped_ptr<ExtensionPermissionSet> set2;
+  scoped_ptr<ExtensionPermissionSet> union_set;
+
+  // Union with an empty set.
+  apis1.insert(ExtensionAPIPermission::Tab());
+  apis1.insert(ExtensionAPIPermission::Background());
+  expected_apis.insert(ExtensionAPIPermission::Tab());
+  expected_apis.insert(ExtensionAPIPermission::Background());
+
+  AddPattern(&hosts1, "http://*.google.com/*");
+  AddPattern(&expected_hosts, "http://*.google.com/*");
+
+  set1.reset(new ExtensionPermissionSet(native_code1, apis1, hosts1));
+  set2.reset(new ExtensionPermissionSet(native_code2, apis2, hosts2));
+  union_set.reset(ExtensionPermissionSet::CreateUnion(*set1, *set2));
+
+  EXPECT_EQ(expected_native_code, union_set->native_code());
+  EXPECT_EQ(expected_apis, union_set->apis());
+  AssertEqualExtents(expected_hosts, union_set->effective_hosts());
+
+  // Now use a real second set.
+  apis2.insert(ExtensionAPIPermission::Tab());
+  apis2.insert(ExtensionAPIPermission::Proxy());
+  apis2.insert(ExtensionAPIPermission::ClipboardWrite());
+  expected_apis.insert(ExtensionAPIPermission::Tab());
+  expected_apis.insert(ExtensionAPIPermission::Proxy());
+  expected_apis.insert(ExtensionAPIPermission::ClipboardWrite());
+
+  AddPattern(&hosts2, "http://*.example.com/*");
+  AddPattern(&hosts2, "http://*.google.com/*");
+  AddPattern(&expected_hosts, "http://*.example.com/*");
+
+  native_code2 = true;
+  expected_native_code = true;
+
+  set2.reset(new ExtensionPermissionSet(native_code2, apis2, hosts2));
+  union_set.reset(ExtensionPermissionSet::CreateUnion(*set1, *set2));
+  EXPECT_EQ(expected_native_code, union_set->native_code());
+  EXPECT_EQ(expected_apis, union_set->apis());
+  AssertEqualExtents(expected_hosts, union_set->effective_hosts());
+}
+
+TEST(ExtensionPermissionSetTest, HasLessPrivilegesThan) {
+  const struct {
+    const char* base_name;
+    // Increase these sizes if you have more than 10.
+    const char* granted_apis[10];
+    const char* granted_hosts[10];
+    bool full_access;
+    bool expect_increase;
+  } kTests[] = {
+    { "allhosts1", {NULL}, {"http://*/", NULL}, false,
+      false },  // all -> all
+    { "allhosts2", {NULL}, {"http://*/", NULL}, false,
+      false },  // all -> one
+    { "allhosts3", {NULL}, {NULL}, false, true },  // one -> all
+    { "hosts1", {NULL},
+      {"http://www.google.com/", "http://www.reddit.com/", NULL}, false,
+      false },  // http://a,http://b -> http://a,http://b
+    { "hosts2", {NULL},
+      {"http://www.google.com/", "http://www.reddit.com/", NULL}, false,
+      true },  // http://a,http://b -> https://a,http://*.b
+    { "hosts3", {NULL},
+      {"http://www.google.com/", "http://www.reddit.com/", NULL}, false,
+      false },  // http://a,http://b -> http://a
+    { "hosts4", {NULL},
+      {"http://www.google.com/", NULL}, false,
+      true },  // http://a -> http://a,http://b
+    { "hosts5", {"tabs", "notifications", NULL},
+      {"http://*.example.com/", "http://*.example.com/*",
+       "http://*.example.co.uk/*", "http://*.example.com.au/*",
+       NULL}, false,
+      false },  // http://a,b,c -> http://a,b,c + https://a,b,c
+    { "hosts6", {"tabs", "notifications", NULL},
+      {"http://*.example.com/", "http://*.example.com/*", NULL}, false,
+      false },  // http://a.com -> http://a.com + http://a.co.uk
+    { "permissions1", {"tabs", NULL},
+      {NULL}, false, false },  // tabs -> tabs
+    { "permissions2", {"tabs", NULL},
+      {NULL}, false, true },  // tabs -> tabs,bookmarks
+    { "permissions3", {NULL},
+      {"http://*/*", NULL},
+      false, true },  // http://a -> http://a,tabs
+    { "permissions5", {"bookmarks", NULL},
+      {NULL}, false, true },  // bookmarks -> bookmarks,history
+#if !defined(OS_CHROMEOS)  // plugins aren't allowed in ChromeOS
+    { "permissions4", {NULL},
+      {NULL}, true, false },  // plugin -> plugin,tabs
+    { "plugin1", {NULL},
+      {NULL}, true, false },  // plugin -> plugin
+    { "plugin2", {NULL},
+      {NULL}, true, false },  // plugin -> none
+    { "plugin3", {NULL},
+      {NULL}, false, true },  // none -> plugin
+#endif
+    { "storage", {NULL},
+      {NULL}, false, false },  // none -> storage
+    { "notifications", {NULL},
+      {NULL}, false, false }  // none -> notifications
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kTests); ++i) {
+    scoped_refptr<Extension> old_extension(
+        LoadManifest("allow_silent_upgrade",
+                     std::string(kTests[i].base_name) + "_old.json"));
+    scoped_refptr<Extension> new_extension(
+        LoadManifest("allow_silent_upgrade",
+                     std::string(kTests[i].base_name) + "_new.json"));
+
+    std::set<ExtensionAPIPermission> granted_apis;
+    for (size_t j = 0; kTests[i].granted_apis[j] != NULL; ++j) {
+      granted_apis.insert(
+          *ExtensionAPIPermission::GetByName(kTests[i].granted_apis[j]));
+    }
+
+    URLPatternSet granted_hosts;
+    for (size_t j = 0; kTests[i].granted_hosts[j] != NULL; ++j)
+      AddPattern(&granted_hosts, kTests[i].granted_hosts[j]);
+
+    EXPECT_TRUE(new_extension.get()) << kTests[i].base_name << "_new.json";
+    if (!new_extension.get())
+      continue;
+
+    ExtensionPermissionSet old_p = old_extension->permission_set();
+    ExtensionPermissionSet new_p = new_extension->permission_set();
+
+    EXPECT_EQ(kTests[i].expect_increase, old_p.HasLessPrivilegesThan(new_p))
+        << kTests[i].base_name;
+  }
+}
+
+TEST(ExtensionPermissionSetTest, PermissionMessages) {
+  // Ensure that all permissions that needs to show install UI actually have
+  // strings associated with them.
+  std::set<ExtensionAPIPermission> skip;
+
+  // These are considered "nuisance" or "trivial" permissions that don't need
+  // a prompt.
+  skip.insert(ExtensionAPIPermission::ContextMenus());
+  skip.insert(ExtensionAPIPermission::Idle());
+  skip.insert(ExtensionAPIPermission::Notification());
+  skip.insert(ExtensionAPIPermission::UnlimitedStorage());
+  skip.insert(ExtensionAPIPermission::ContentSettings());
+
+  // TODO(erikkay) add a string for this permission.
+  skip.insert(ExtensionAPIPermission::Background());
+
+  skip.insert(ExtensionAPIPermission::ClipboardWrite());
+
+  // The cookie permission does nothing unless you have associated host
+  // permissions.
+  skip.insert(ExtensionAPIPermission::Cookie());
+
+  // The proxy permission is warned as part of host permission checks.
+  skip.insert(ExtensionAPIPermission::Proxy());
+
+  // This permission requires explicit user action (context menu handler)
+  // so we won't prompt for it for now.
+  skip.insert(ExtensionAPIPermission::FileBrowserHandler());
+
+  // If you've turned on the experimental command-line flag, we don't need
+  // to warn you further.
+  skip.insert(ExtensionAPIPermission::Experimental());
+
+  // These are private.
+  skip.insert(ExtensionAPIPermission::WebstorePrivate());
+  skip.insert(ExtensionAPIPermission::FileBrowserPrivate());
+  skip.insert(ExtensionAPIPermission::MediaPlayerPrivate());
+  skip.insert(ExtensionAPIPermission::ChromePrivate());
+  skip.insert(ExtensionAPIPermission::ChromeosInfoPrivate());
+  skip.insert(ExtensionAPIPermission::WebSocketProxyPrivate());
+
+  std::set<ExtensionAPIPermission> permissions =
+      ExtensionAPIPermission::GetAll();
+
+  const ExtensionPermissionMessage::MessageId ID_NONE =
+      ExtensionPermissionMessage::ID_NONE;
+
+  for (std::set<ExtensionAPIPermission>::const_iterator i = permissions.begin();
+       i != permissions.end(); ++i) {
+    ExtensionAPIPermission permission = *i;
+    if (skip.count(permission)) {
+      EXPECT_EQ(ID_NONE, permission.message_id())
+          << "unexpected message_id for " << permission.name();
+    } else {
+      EXPECT_NE(ID_NONE, permission.message_id())
+          << "missing message_id for " << permission.name();
+    }
+  }
+}
+
+// Tests the default permissions (empty API permission set).
+TEST(ExtensionPermissionSetTest, DefaultFunctionAccess) {
+  const struct {
+    const char* permission_name;
+    bool expect_success;
+  } kTests[] = {
+    // Negative test.
+    { "non_existing_permission", false },
+    // Test default module/package permission.
+    { "browserAction",  true },
+    { "browserActions", true },
+    { "devtools",       true },
+    { "extension",      true },
+    { "i18n",           true },
+    { "pageAction",     true },
+    { "pageActions",    true },
+    { "test",           true },
+    // Some negative tests.
+    { "bookmarks",      false },
+    { "cookies",        false },
+    { "history",        false },
+    { "tabs.onUpdated", false },
+    // Make sure we find the module name after stripping '.' and '/'.
+    { "browserAction/abcd/onClick",  true },
+    { "browserAction.abcd.onClick",  true },
+    // Test Tabs functions.
+    { "tabs.create",      true},
+    { "tabs.update",      true},
+    { "tabs.getSelected", false},
+  };
+
+  ExtensionPermissionSet permissions(
+      false, std::set<ExtensionAPIPermission>(), URLPatternSet());
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kTests); ++i) {
+    EXPECT_EQ(kTests[i].expect_success,
+              permissions.HasAccessToFunction(kTests[i].permission_name));
+  }
+}
+
+TEST(ExtensionPermissionSetTest, GetWarningMessages_ManyHosts) {
+  scoped_refptr<Extension> extension;
+
+  extension = LoadManifest("permissions", "many-hosts.json");
+  std::vector<string16> warnings =
+      extension->permission_set().GetWarningMessages();
+  ASSERT_EQ(1u, warnings.size());
+  EXPECT_EQ("Your data on www.google.com and encrypted.google.com",
+            UTF16ToUTF8(warnings[0]));
+}
+
+TEST(ExtensionPermissionSetTest, GetWarningMessages_Plugins) {
+  scoped_refptr<Extension> extension;
+  scoped_ptr<ExtensionPermissionSet> permissions;
+
+  extension = LoadManifest("permissions", "plugins.json");
+  std::vector<string16> warnings =
+      extension->permission_set().GetWarningMessages();
+  // We don't parse the plugins key on Chrome OS, so it should not ask for any
+  // permissions.
+#if defined(OS_CHROMEOS)
+  ASSERT_EQ(0u, warnings.size());
+#else
+  ASSERT_EQ(1u, warnings.size());
+  EXPECT_EQ("All data on your computer and the websites you visit",
+            UTF16ToUTF8(warnings[0]));
+#endif
+}
+
+TEST(ExtensionPermissionSetTest, GetDistinctHostsForDisplay) {
+  scoped_ptr<ExtensionPermissionSet> perm_set;
+  std::set<ExtensionAPIPermission> empty_perms;
+  std::vector<std::string> expected;
+  expected.push_back("www.foo.com");
+  expected.push_back("www.bar.com");
+  expected.push_back("www.baz.com");
+  URLPatternSet actual;
+
+  {
+    SCOPED_TRACE("no dupes");
+
+    // Simple list with no dupes.
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.com/path"));
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.bar.com/path"));
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.baz.com/path"));
+    perm_set.reset(new ExtensionPermissionSet(false, empty_perms, actual));
+    CompareLists(expected, perm_set->GetDistinctHostsForDisplay());
+  }
+
+  {
+    SCOPED_TRACE("two dupes");
+
+    // Add some dupes.
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.com/path"));
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.baz.com/path"));
+    perm_set.reset(new ExtensionPermissionSet(false, empty_perms, actual));
+    CompareLists(expected, perm_set->GetDistinctHostsForDisplay());
+  }
+
+  {
+    SCOPED_TRACE("schemes differ");
+
+    // Add a pattern that differs only by scheme. This should be filtered out.
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTPS, "https://www.bar.com/path"));
+    perm_set.reset(new ExtensionPermissionSet(false, empty_perms, actual));
+    CompareLists(expected, perm_set->GetDistinctHostsForDisplay());
+  }
+
+  {
+    SCOPED_TRACE("paths differ");
+
+    // Add some dupes by path.
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.bar.com/pathypath"));
+    perm_set.reset(new ExtensionPermissionSet(false, empty_perms, actual));
+    CompareLists(expected, perm_set->GetDistinctHostsForDisplay());
+  }
+
+  {
+    SCOPED_TRACE("subdomains differ");
+
+    // We don't do anything special for subdomains.
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://monkey.www.bar.com/path"));
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://bar.com/path"));
+
+    expected.push_back("monkey.www.bar.com");
+    expected.push_back("bar.com");
+
+    perm_set.reset(new ExtensionPermissionSet(false, empty_perms, actual));
+    CompareLists(expected, perm_set->GetDistinctHostsForDisplay());
+  }
+
+  {
+    SCOPED_TRACE("RCDs differ");
+
+    // Now test for RCD uniquing.
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.com/path"));
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.co.uk/path"));
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.de/path"));
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.ca.us/path"));
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.net/path"));
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.com.my/path"));
+
+    // This is an unknown RCD, which shouldn't be uniqued out.
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.xyzzy/path"));
+    // But it should only occur once.
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.xyzzy/path"));
+
+    expected.push_back("www.foo.xyzzy");
+
+    perm_set.reset(new ExtensionPermissionSet(false, empty_perms, actual));
+    CompareLists(expected, perm_set->GetDistinctHostsForDisplay());
+  }
+
+  {
+    SCOPED_TRACE("wildcards");
+
+    actual.AddPattern(
+        URLPattern(URLPattern::SCHEME_HTTP, "http://*.google.com/*"));
+
+    expected.push_back("*.google.com");
+
+    perm_set.reset(new ExtensionPermissionSet(false, empty_perms, actual));
+    CompareLists(expected, perm_set->GetDistinctHostsForDisplay());
+  }
+}
+
+TEST(ExtensionPermissionSetTest, GetDistinctHostsForDisplay_ComIsBestRcd) {
+  scoped_ptr<ExtensionPermissionSet> perm_set;
+  std::set<ExtensionAPIPermission> empty_perms;
+  URLPatternSet actual;
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.ca/path"));
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.org/path"));
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.co.uk/path"));
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.net/path"));
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.jp/path"));
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.com/path"));
+
+  std::vector<std::string> expected;
+  expected.push_back("www.foo.com");
+  perm_set.reset(new ExtensionPermissionSet(false, empty_perms, actual));
+  CompareLists(expected, perm_set->GetDistinctHostsForDisplay());
+}
+
+TEST(ExtensionPermissionSetTest, GetDistinctHostsForDisplay_NetIs2ndBestRcd) {
+  scoped_ptr<ExtensionPermissionSet> perm_set;
+  std::set<ExtensionAPIPermission> empty_perms;
+  URLPatternSet actual;
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.ca/path"));
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.org/path"));
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.co.uk/path"));
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.net/path"));
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.jp/path"));
+  // No http://www.foo.com/path
+
+  std::vector<std::string> expected;
+  expected.push_back("www.foo.net");
+  perm_set.reset(new ExtensionPermissionSet(false, empty_perms, actual));
+  CompareLists(expected, perm_set->GetDistinctHostsForDisplay());
+}
+
+TEST(ExtensionPermissionSetTest,
+     GetDistinctHostsForDisplay_OrgIs3rdBestRcd) {
+  scoped_ptr<ExtensionPermissionSet> perm_set;
+  std::set<ExtensionAPIPermission> empty_perms;
+  URLPatternSet actual;
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.ca/path"));
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.org/path"));
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.co.uk/path"));
+  // No http://www.foo.net/path
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.jp/path"));
+  // No http://www.foo.com/path
+
+  std::vector<std::string> expected;
+  expected.push_back("www.foo.org");
+  perm_set.reset(new ExtensionPermissionSet(false, empty_perms, actual));
+  CompareLists(expected, perm_set->GetDistinctHostsForDisplay());
+}
+
+TEST(ExtensionPermissionSetTest,
+     GetDistinctHostsForDisplay_FirstInListIs4thBestRcd) {
+  scoped_ptr<ExtensionPermissionSet> perm_set;
+  std::set<ExtensionAPIPermission> empty_perms;
+  URLPatternSet actual;
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.ca/path"));
+  // No http://www.foo.org/path
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.co.uk/path"));
+  // No http://www.foo.net/path
+  actual.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.foo.jp/path"));
+  // No http://www.foo.com/path
+
+  std::vector<std::string> expected;
+  expected.push_back("www.foo.ca");
+  perm_set.reset(new ExtensionPermissionSet(false, empty_perms, actual));
+  CompareLists(expected, perm_set->GetDistinctHostsForDisplay());
+}
+
+TEST(ExtensionPermissionSetTest, HasLessHostPrivilegesThan) {
+  URLPatternSet list1;
+  URLPatternSet list2;
+  scoped_ptr<ExtensionPermissionSet> set1;
+  scoped_ptr<ExtensionPermissionSet> set2;
+  std::set<ExtensionAPIPermission> empty_perms;
+  list1.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.google.com.hk/path"));
+  list1.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.google.com/path"));
+
+  // Test that the host order does not matter.
+  list2.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.google.com/path"));
+  list2.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.google.com.hk/path"));
+
+  set1.reset(new ExtensionPermissionSet(false, empty_perms, list1));
+  set2.reset(new ExtensionPermissionSet(false, empty_perms, list2));
+
+  EXPECT_FALSE(set1->HasLessHostPrivilegesThan(*set2));
+  EXPECT_FALSE(set2->HasLessHostPrivilegesThan(*set1));
+
+  // Test that paths are ignored.
+  list2.ClearPatterns();
+  list2.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.google.com/*"));
+  set2.reset(new ExtensionPermissionSet(false, empty_perms, list2));
+  EXPECT_FALSE(set1->HasLessHostPrivilegesThan(*set2));
+  EXPECT_FALSE(set2->HasLessHostPrivilegesThan(*set1));
+
+  // Test that RCDs are ignored.
+  list2.ClearPatterns();
+  list2.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.google.com.hk/*"));
+  set2.reset(new ExtensionPermissionSet(false, empty_perms, list2));
+  EXPECT_FALSE(set1->HasLessHostPrivilegesThan(*set2));
+  EXPECT_FALSE(set2->HasLessHostPrivilegesThan(*set1));
+
+  // Test that subdomain wildcards are handled properly.
+  list2.ClearPatterns();
+  list2.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://*.google.com.hk/*"));
+  set2.reset(new ExtensionPermissionSet(false, empty_perms, list2));
+  EXPECT_TRUE(set1->HasLessHostPrivilegesThan(*set2));
+  //TODO(jstritar): Does not match subdomains properly. http://crbug.com/65337
+  //EXPECT_FALSE(set2->HasLessHostPrivilegesThan(*set1));
+
+  // Test that different domains count as different hosts.
+  list2.ClearPatterns();
+  list2.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.google.com/path"));
+  list2.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://www.example.org/path"));
+  set2.reset(new ExtensionPermissionSet(false, empty_perms, list2));
+  EXPECT_TRUE(set1->HasLessHostPrivilegesThan(*set2));
+  EXPECT_FALSE(set2->HasLessHostPrivilegesThan(*set1));
+
+  // Test that different subdomains count as different hosts.
+  list2.ClearPatterns();
+  list2.AddPattern(
+      URLPattern(URLPattern::SCHEME_HTTP, "http://mail.google.com/*"));
+  set2.reset(new ExtensionPermissionSet(false, empty_perms, list2));
+  EXPECT_TRUE(set1->HasLessHostPrivilegesThan(*set2));
+  EXPECT_TRUE(set2->HasLessHostPrivilegesThan(*set1));
+}