Add unit test for the Settings API Bubble.

chrome/browser/extensions/settings_api_helpers.cc

Index: chrome/browser/extensions/settings_api_helpers.cc
diff --git a/chrome/browser/extensions/settings_api_helpers.cc b/chrome/browser/extensions/settings_api_helpers.cc
new file mode 100644
index 0000000000000000000000000000000000000000..839098cbd4b0814000c3a36dc0a7a9ef4bb98871
--- /dev/null
+++ b/chrome/browser/extensions/settings_api_helpers.cc
@@ -0,0 +1,103 @@
+// Copyright (c) 2014 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/browser/extensions/settings_api_helpers.h"
+
+#include "chrome/browser/extensions/api/preference/preference_api.h"
+#include "chrome/common/pref_names.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/common/extension_set.h"
+
+namespace extensions {
+
+const extensions::SettingsOverrides* FindOverridingExtension(
+    content::BrowserContext* browser_context,
+    SettingsApiOverrideType type,
+    const Extension** extension) {
+  const extensions::ExtensionSet& extensions =
+      extensions::ExtensionRegistry::Get(browser_context)->enabled_extensions();
+
+  for (extensions::ExtensionSet::const_iterator it = extensions.begin();
+       it != extensions.end();
+       ++it) {
+    const extensions::SettingsOverrides* settings =
+        extensions::SettingsOverrides::Get(*it);
+    if (settings) {
+      if (type == BUBBLE_TYPE_HOME_PAGE && !settings->homepage)
+        continue;
+      if (type == BUBBLE_TYPE_STARTUP_PAGES && settings->startup_pages.empty())
+        continue;
+      if (type == BUBBLE_TYPE_SEARCH_ENGINE && !settings->search_engine)
+        continue;
+
+      std::string key;
+      switch (type) {
+        case BUBBLE_TYPE_HOME_PAGE:
+          key = prefs::kHomePage;
+          break;
+        case BUBBLE_TYPE_STARTUP_PAGES:
+          key = prefs::kRestoreOnStartup;
+          break;
+        case BUBBLE_TYPE_SEARCH_ENGINE:
+          key = prefs::kDefaultSearchProviderEnabled;
+          break;
+      }
+
+      // Found an extension overriding the current type, check if primary.
+      PreferenceAPI* preference_api = PreferenceAPI::Get(browser_context);
+      if (preference_api &&  // Expected to be NULL in unit tests.
+          !preference_api->DoesExtensionControlPref((*it)->id(), key, NULL))
+        continue;  // Not primary.
+
+      // Found the primary extension, return its setting.
+      *extension = *it;
+      return settings;
+    }
+  }
+
+  return NULL;
+}
+
+const Extension* OverridesHomepage(content::BrowserContext* browser_context,
+                                   GURL* home_page_url) {
+  const extensions::Extension* extension = NULL;
+  const extensions::SettingsOverrides* settings =
+      FindOverridingExtension(
+          browser_context, BUBBLE_TYPE_HOME_PAGE, &extension);
+
+  if (settings && home_page_url)
+    *home_page_url = *settings->homepage;
+  return extension;
+}
+
+const Extension* OverridesStartupPages(content::BrowserContext* browser_context,
+                                       std::vector<GURL>* startup_pages) {
+  const extensions::Extension* extension = NULL;
+  const extensions::SettingsOverrides* settings =
+      FindOverridingExtension(
+          browser_context, BUBBLE_TYPE_STARTUP_PAGES, &extension);
+  if (settings && startup_pages) {
+    startup_pages->clear();
+    for (std::vector<GURL>::const_iterator it = settings->startup_pages.begin();
+         it != settings->startup_pages.end();
+         ++it)
+      startup_pages->push_back(GURL(*it));
+  }
+  return extension;
+}
+
+const Extension* OverridesSearchEngine(
+    content::BrowserContext* browser_context,
+    api::manifest_types::ChromeSettingsOverrides::Search_provider*
+        search_provider) {
+  const extensions::Extension* extension = NULL;
+  const extensions::SettingsOverrides* settings =
+      FindOverridingExtension(
+          browser_context, BUBBLE_TYPE_SEARCH_ENGINE, &extension);
+  if (settings && search_provider)
+    search_provider = settings->search_engine.get();
+  return extension;
+}
+
+}  // namespace extensions