Makes window focused for gpu pixel test

chrome/test/gpu/gpu_pixel_browsertest.cc

 // Copyright (c) 2012 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/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
@@ skipping 294 matching lines @@
 #endif
 
 IN_PROC_BROWSER_TEST_F(GpuPixelBrowserTest, MAYBE_WebGLTeapot) {
   // If test baseline needs to be updated after a given revision, update the
   // revision number in SetRefImageNoOlderThan(#revision).
   SetRefImageRevisionNoOlderThan(116356);
 
   gfx::Size container_size(500, 500);
   ResizeTabContainer(browser(), container_size);
 
+  browser()->window()->Activate();

[sky, 2012/01/11 22:29:25]

Use ui_test_utils::SHowAndFocusNativeWindow and ASSERT on the result.

+
   ui_test_utils::DOMMessageQueue message_queue;
   ui_test_utils::NavigateToURL(
       browser(),
       net::FilePathToFileURL(test_data_dir_.AppendASCII("webgl_teapot").
           AppendASCII("teapot.html")));
 
   // Wait for message from teapot page indicating the GL calls have been issued.
   ASSERT_TRUE(message_queue.WaitForMessage(NULL));
 
   std::vector<unsigned char> screenshot_png;
@@ skipping 14 matching lines @@
 
   SkBitmap bitmap;
   success = gfx::PNGCodec::Decode(
       reinterpret_cast<unsigned char*>(&*screenshot_png.begin()),
       screenshot_png.size(),
       &bitmap);
 
   ASSERT_TRUE(success);
   ASSERT_TRUE(CompareImages(bitmap));
 }