Sessions API - previously Session Restore API. Supports restoring currently open foreign windows an…

chrome/browser/extensions/api/tabs/windows_helper.cc

Index: chrome/browser/extensions/api/tabs/windows_helper.cc
diff --git a/chrome/browser/extensions/api/tabs/windows_helper.cc b/chrome/browser/extensions/api/tabs/windows_helper.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d0480efdc3799c3ab1b7d759e0f6b6a00b5046df
--- /dev/null
+++ b/chrome/browser/extensions/api/tabs/windows_helper.cc
@@ -0,0 +1,44 @@
+// Copyright (c) 2013 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/api/tabs/windows_helper.h"
+
+#include "base/strings/string_number_conversions.h"
+#include "chrome/browser/extensions/api/tabs/tabs_constants.h"
+#include "chrome/browser/extensions/extension_function.h"
+#include "chrome/browser/extensions/extension_function_dispatcher.h"
+#include "chrome/browser/extensions/window_controller.h"
+#include "chrome/browser/extensions/window_controller_list.h"
+#include "extensions/common/error_utils.h"
+
+bool GetWindowFromWindowID(UIThreadExtensionFunction* function,
+                           int window_id,
+                           extensions::WindowController** controller) {
+  if (window_id == extension_misc::kCurrentWindowId) {
+    extensions::WindowController* extension_window_controller =
+        function->dispatcher()->delegate()->GetExtensionWindowController();
+    // If there is a window controller associated with this extension, use that.
+    if (extension_window_controller) {
+      *controller = extension_window_controller;
+    } else {
+      // Otherwise get the focused or most recently added window.
+      *controller = extensions::WindowControllerList::GetInstance()->
+          CurrentWindowForFunction(function);
+    }
+    if (!(*controller)) {
+      function->SetError(extensions::tabs_constants::kNoCurrentWindowError);
+      return false;
+    }
+  } else {
+    *controller = extensions::WindowControllerList::GetInstance()->
+        FindWindowForFunctionById(function, window_id);
+    if (!(*controller)) {
+      function->SetError(extensions::ErrorUtils::FormatErrorMessage(
+          extensions::tabs_constants::kWindowNotFoundError,
+          base::IntToString(window_id)));
+      return false;
+    }
+  }
+  return true;
+}