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

chrome/browser/plugins/plugin_power_saver_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 <stdint.h>
 #include <string>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/stl_util.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/scoped_feature_list.h"
+#include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/test_switches.h"
 #include "chrome/test/base/ui_test_utils.h"
@@ skipping 189 matching lines @@
   return success;
 }
 
 // |snapshot_matches| is set to true if the snapshot matches the reference and
 // the test passes. Otherwise, set to false.
 void CompareSnapshotToReference(const base::FilePath& reference,
                                 bool* snapshot_matches,
                                 const base::Closure& done_cb,
                                 const SkBitmap& bitmap,
                                 content::ReadbackResponse response) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   DCHECK(snapshot_matches);
   ASSERT_EQ(content::READBACK_SUCCESS, response);
 
   *snapshot_matches = SnapshotMatches(reference, bitmap);
 
   // When rebaselining the pixel test, the test may fail. However, the
   // reference file will still be overwritten.
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kRebaselinePixelTests)) {
     SkBitmap clipped_bitmap;
@@ skipping 401 matching lines @@
 IN_PROC_BROWSER_TEST_F(PluginPowerSaverPreferHtmlBrowserTest,
                        ThrottlePluginsOnAllowContentSetting) {
   HostContentSettingsMap* content_settings_map =
       HostContentSettingsMapFactory::GetForProfile(browser()->profile());
 
   content_settings_map->SetDefaultContentSetting(CONTENT_SETTINGS_TYPE_PLUGINS,
                                                  CONTENT_SETTING_ALLOW);
   LoadPeripheralPlugin();
   VerifyPluginIsThrottled(GetActiveWebContents(), "plugin");
 }