Add chrome.searchEnginesPrivate API and Search Settings page.

chrome/common/extensions/api/search_engines_private.idl

+// Copyright 2015 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.
+
+// Use the <code>chrome.searchEnginesPrivate</code> API to get or set preferences
+// from the settings UI.
+namespace searchEnginesPrivate {
+
+  dictionary SearchEngine {
+    // The unique ID of the engine in the list.
+    DOMString guid;
+
+    // The name of the engine.
+    DOMString name;
+
+    // Whether the engine is default.
+    boolean isDefault;
+  };
+
+  callback SearchEnginesCallback = void (SearchEngine[] engines);
+
+  interface Functions {
+    // Gets an array of all the search engines.
+    static void getDefaultSearchEngines(SearchEnginesCallback callback);

[Jeremy Klein, 2015/04/22 17:37:46]

nit: It seems weird to have the word "Default" in here since really it's just
all search engines.

[Oren Blasberg, 2015/04/22 17:41:22]

In the future there will also be "custom" / "other" search engines which pertain
to those lower down in the 'manage search engines' dialog. You can see this at
chrome://settings/searchEngines.  Hence I think "default" is a good specifier.
WDYT? Maybe I could add a comment explaining that?

[Oren Blasberg, 2015/04/22 19:04:17]

Done.

+
+    // Sets the default search engine.
+    static void setDefaultSearchEngine(DOMString guid);
+  };
+
+  interface Events {
+    // Fires when the list of engines or the default engine changes.
+    static void onSearchEnginesChanged(SearchEngine[] engines);
+  };
+};