Added a comment to PlatformAppBrowserTest.WindowDotPrintWorks.

chrome/browser/apps/app_browsertest.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 "apps/launcher.h"
 #include "apps/native_app_window.h"
 #include "apps/shell_window.h"
 #include "apps/shell_window_registry.h"
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 1019 matching lines @@
   LoadAndLaunchPlatformApp("minimal");
   ASSERT_TRUE(launched_listener.WaitUntilSatisfied());
 
   EXPECT_EQ(1LU, GetShellWindowCount());
   ShellWindowRegistry::ShellWindowList shell_windows = ShellWindowRegistry::Get(
       browser()->profile())->shell_windows();
   EXPECT_TRUE((*shell_windows.begin())->web_contents()->
       GetRenderWidgetHostView()->HasFocus());
 }
 
-// Currently this test only works if the PDF preview plug-in is available. This
-// will only happen in Chrome release builds or if the plug-in has been manually
-// copied from a Chrome release build. In the former case, this test will run
-// automatically. In the later case, it can be run manually by commenting out
-// the next three lines and the corresponding #endif and then running
-// browser_tests with a --enable-print-preview flag.
+// The next test will only run automatically with Chrome branded builds because
+// it requires the PDF preview plug-in. To run this test manually for Chromium
+// builds (non-Chrome branded) in a development environment:
+//
+//   1) Remove "MAYBE_" in the first line of the test definition
+//   2) Build Chromium browser_tests
+//   3) Make a copy of the PDF plug-in from a recent version of Chrome (Canary
+//      or recent development build) to your Chromium build. On Linux and Chrome
+//      OS, this just involves copying /opt/google.chrome/libpdf.so to
+//      <path-to-your-src>/out/Debug.
+//   4) Run browser_tests with the --enable-print-preview flag
+
 #if !defined(GOOGLE_CHROME_BUILD)
 #define MAYBE_WindowDotPrintWorks DISABLED_WindowDotPrintWorks
 #else
 #define MAYBE_WindowDotPrintWorks WindowDotPrintWorks
 #endif
 
 IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, MAYBE_WindowDotPrintWorks) {
   PrintPreviewUI::SetAutoCancelForTesting(true);
   ASSERT_TRUE(RunPlatformAppTest("platform_apps/print_api")) << message_;
   PrintPreviewUI::SetAutoCancelForTesting(false);
@@ skipping 55 matching lines @@
 
   while (!ContainsKey(opener_app_ids_, file_manager->id())) {
     content::RunAllPendingInMessageLoop();
   }
 }
 
 #endif  // defined(OS_CHROMEOS)
 
 
 }  // namespace extensions