ProcessSingleton now uses base::win::MessageWindow to create a message-only window.

base/win/message_window_unittest.cc

 // Copyright 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 "base/bind.h"
+#include "base/guid.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/message_window.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 namespace {
 
 bool HandleMessage(
     UINT message, WPARAM wparam, LPARAM lparam, LRESULT* result) {
   // Return |wparam| as the result of WM_USER message.
   if (message == WM_USER) {
     *result = wparam;
     return true;
   }
 
   return false;
 }
 
 }  // namespace
 
 // Checks that a window can be created.
 TEST(MessageWindowTest, Create) {
   win::MessageWindow window;
   EXPECT_TRUE(window.Create(base::Bind(&HandleMessage)));
 }
 
+// Checks that a named window can be created.
 TEST(MessageWindowTest, CreateNamed) {
   win::MessageWindow window;
   EXPECT_TRUE(window.CreateNamed(base::Bind(&HandleMessage),
               UTF8ToUTF16("test_message_window")));
 }
 
 // Verifies that the created window can receive messages.
 TEST(MessageWindowTest, SendMessage) {
   win::MessageWindow window;
   EXPECT_TRUE(window.Create(base::Bind(&HandleMessage)));
 
   EXPECT_EQ(SendMessage(window.hwnd(), WM_USER, 100, 0), 100);
 }
 
+// Verifies that a named window can be found by name.
+TEST(MessageWindowTest, FindWindow) {
+  string16 name = UTF8ToUTF16(base::GenerateGUID());
+  win::MessageWindow window;
+  EXPECT_TRUE(window.CreateNamed(base::Bind(&HandleMessage), name));
+
+  HWND hwnd = win::MessageWindow::FindWindow(name);
+  EXPECT_TRUE(hwnd != NULL);
+  EXPECT_EQ(SendMessage(hwnd, WM_USER, 200, 0), 200);
+}
+
 }  // namespace base