Fix integration tests in src/chrome and src/extensions so that we can turn on IO thread checks wi...

chrome/browser/task_manager/providers/web_contents/tab_contents_tag_browsertest.cc

 // 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.
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "chrome/browser/task_manager/mock_web_contents_task_manager.h"
 #include "chrome/browser/task_manager/providers/web_contents/web_contents_tags_manager.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/grit/generated_resources.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "components/favicon/content/content_favicon_driver.h"
 #include "components/favicon/core/favicon_driver.h"
@@ skipping 267 matching lines @@
   favicon::ContentFaviconDriver* favicon_driver =
       favicon::ContentFaviconDriver::FromWebContents(
           browser()->tab_strip_model()->GetActiveWebContents());
   FaviconWaiter waiter(favicon_driver);
   waiter.WaitForFaviconWithURL(GetUrlOfFile("/favicon/icon.png"));
 
   // Check that the task manager uses the specified favicon for the page.
   base::FilePath test_dir;
   PathService::Get(chrome::DIR_TEST_DATA, &test_dir);
   std::string favicon_string;
-  base::ReadFileToString(
-      test_dir.AppendASCII("favicon").AppendASCII("icon.png"), &favicon_string);
+  {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    base::ReadFileToString(
+        test_dir.AppendASCII("favicon").AppendASCII("icon.png"),
+        &favicon_string);
+  }
   SkBitmap favicon_bitmap;
   gfx::PNGCodec::Decode(
       reinterpret_cast<const unsigned char*>(favicon_string.data()),
       favicon_string.length(), &favicon_bitmap);
   ASSERT_TRUE(
       gfx::test::AreBitmapsEqual(favicon_bitmap, *task->icon().bitmap()));
 
   // Navigate to a page without a favicon.
   GURL no_favicon_page_url = GetUrlOfFile("/title1.html");
   ui_test_utils::NavigateToURL(browser(), no_favicon_page_url);
   ASSERT_EQ(GetDefaultTitleForUrl(no_favicon_page_url), task->title());
 
   // Check that the task manager uses the default favicon for the page.
   gfx::Image default_favicon_image =
       ResourceBundle::GetSharedInstance().GetNativeImageNamed(
           IDR_DEFAULT_FAVICON);
   EXPECT_TRUE(gfx::test::AreImagesEqual(default_favicon_image,
                                         gfx::Image(task->icon())));
 }
 
 }  // namespace task_manager