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

chrome/browser/extensions/api/media_galleries/media_galleries_watch_apitest.cc

 // Copyright 2014 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.
 //
 // MediaGalleries gallery watch API browser tests.
 
 #include "base/files/file_path.h"
 #include "base/files/file_path_watcher.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/media_galleries/media_file_system_registry.h"
 #include "chrome/browser/media_galleries/media_galleries_preferences.h"
 #include "chrome/browser/media_galleries/media_galleries_test_util.h"
 #include "chrome/common/chrome_paths.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "extensions/browser/process_manager.h"
@@ skipping 79 matching lines @@
 
   void ExecuteCmdAndCheckReply(const std::string& js_command,
                                const std::string& ok_message) {
     ExtensionTestMessageListener listener(ok_message, false);
     background_host_->GetMainFrame()->ExecuteJavaScriptForTests(
         base::ASCIIToUTF16(js_command));
     EXPECT_TRUE(listener.WaitUntilSatisfied());
   }
 
   bool AddNewFileInTestGallery() {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
     base::FilePath gallery_file =
         test_gallery_.GetPath().Append(FILE_PATH_LITERAL("test1.txt"));
     std::string content("new content");
     int write_size =
         base::WriteFile(gallery_file, content.c_str(), content.length());
     return (write_size == static_cast<int>(content.length()));
   }
 
   void SetupGalleryWatches() {
     std::string expected_result = GalleryWatchesSupported()
@@ skipping 159 matching lines @@
 
 IN_PROC_BROWSER_TEST_F(MediaGalleriesGalleryWatchApiTest,
                        SetupWatchOnInvalidGallery) {
   // Add gallery watch listener.
   ExecuteCmdAndCheckReply(kAddGalleryChangedListenerCmd,
                           kAddGalleryChangedListenerOK);
   // Set up a invalid gallery watch.
   ExecuteCmdAndCheckReply(
       kSetupWatchOnInvalidGalleryCmd, kAddGalleryWatchRequestFailed);
 }