Use TaskScheduler instead of blocking pool in chrome_views_delegate.cc.

chrome/browser/ui/views/chrome_views_delegate.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 "chrome/browser/ui/views/chrome_views_delegate.h"
 
 #include <memory>
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/task_scheduler/post_task.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/lifetime/keep_alive_types.h"
 #include "chrome/browser/lifetime/scoped_keep_alive.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/ash/ash_util.h"
 #include "chrome/browser/ui/browser_window_state.h"
@@ skipping 11 matching lines @@
 #include "ui/display/screen.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/views/controls/menu/menu_controller.h"
 #include "ui/views/widget/native_widget.h"
 #include "ui/views/widget/widget.h"
 
 #if defined(OS_WIN)
 #include <dwmapi.h>
 #include <shellapi.h>
 #include "base/profiler/scoped_tracker.h"
-#include "base/task_runner_util.h"
 #include "base/win/windows_version.h"
 #include "chrome/browser/win/app_icon.h"
 #include "ui/base/win/shell.h"
 #endif
 
 #if defined(USE_AURA)
 #include "chrome/browser/ui/aura/accessibility/automation_manager_aura.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #endif
@@ skipping 442 matching lines @@
   // in us thinking there is no auto-hide edges. By returning at least one edge
   // we don't initially go fullscreen until we figure out the real auto-hide
   // edges.
   if (!appbar_autohide_edge_map_.count(monitor))
     appbar_autohide_edge_map_[monitor] = EDGE_BOTTOM;
 
   // We use the SHAppBarMessage API to get the taskbar autohide state. This API
   // spins a modal loop which could cause callers to be reentered. To avoid
   // that we retrieve the taskbar state in a worker thread.
   if (monitor && !in_autohide_edges_callback_) {
-    base::PostTaskAndReplyWithResult(
-        content::BrowserThread::GetBlockingPool(),
-        FROM_HERE,
-        base::Bind(&GetAppbarAutohideEdgesOnWorkerThread,
-                   monitor),
+    // TODO(robliao): Annotate this task with .WithCOM() once supported.
+    // https://crbug.com/662122

[fdoray, 2017/02/17 20:47:23]

Currently, all TaskScheduler threads are CoInitialized. We plan to limit this to
a few threads and to introduce a WithCOM() trait for tasks that need to be
scheduled on a CoInitialized thread.

+    base::PostTaskWithTraitsAndReplyWithResult(
+        FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
+                       base::TaskPriority::USER_BLOCKING),
+        base::Bind(&GetAppbarAutohideEdgesOnWorkerThread, monitor),
         base::Bind(&ChromeViewsDelegate::OnGotAppbarAutohideEdges,
-                   weak_factory_.GetWeakPtr(),
-                   callback,
-                   monitor,
+                   weak_factory_.GetWeakPtr(), callback, monitor,
                    appbar_autohide_edge_map_[monitor]));
   }
   return appbar_autohide_edge_map_[monitor];
 }
 
 void ChromeViewsDelegate::OnGotAppbarAutohideEdges(
     const base::Closure& callback,
     HMONITOR monitor,
     int returned_edges,
     int edges) {
@@ skipping 50 matching lines @@
       LayoutDelegate::Metric::PANEL_CONTENT_MARGIN));
 }
 
 #if !defined(USE_ASH)
 views::Widget::InitParams::WindowOpacity
 ChromeViewsDelegate::GetOpacityForInitParams(
     const views::Widget::InitParams& params) {
   return views::Widget::InitParams::OPAQUE_WINDOW;
 }
 #endif