Use chromeos accelerometer reader and support only lid accelerometer.

chrome/browser/ui/ash/ash_init.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/ash/ash_init.h"
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/accelerometer/accelerometer_controller.h"
 #include "ash/ash_switches.h"
 #include "ash/high_contrast/high_contrast_controller.h"
@@ skipping 53 matching lines @@
   // Shell takes ownership of ChromeShellDelegate.
   shell_init_params.delegate = new ChromeShellDelegate;
   shell_init_params.context_factory = content::GetContextFactory();
 #if defined(OS_WIN)
   shell_init_params.remote_hwnd = remote_window;
 #endif
 
   ash::Shell* shell = ash::Shell::CreateInstance(shell_init_params);
   shell->accelerator_controller()->SetScreenshotDelegate(
       scoped_ptr<ash::ScreenshotDelegate>(new ScreenshotTaker).Pass());
-  // TODO(flackr): Investigate exposing a blocking pool task runner to chromeos.
   shell->accelerometer_controller()->Initialize(
-      content::BrowserThread::GetBlockingPool()->
-          GetTaskRunnerWithShutdownBehavior(
-              base::SequencedWorkerPool::SKIP_ON_SHUTDOWN));
+      content::BrowserThread::GetMessageLoopProxyForThread(
+          content::BrowserThread::FILE));

[oshima, 2014/09/16 21:27:16]

FILE thread is obsolete and we should use BlockingPool. It was my mistake that I
used FILE thread in athena+chrome. I'll fix it.

[flackr, 2014/09/16 22:19:23]

Done, and updated athena/ except for AthenaTestHelper.

 #if defined(OS_CHROMEOS)
   shell->accelerator_controller()->SetImeControlDelegate(
       scoped_ptr<ash::ImeControlDelegate>(new ImeController).Pass());
   shell->high_contrast_controller()->SetEnabled(
       chromeos::AccessibilityManager::Get()->IsHighContrastEnabled());
 
   DCHECK(chromeos::MagnificationManager::Get());
   bool magnifier_enabled =
       chromeos::MagnificationManager::Get()->IsMagnifierEnabled();
   ash::MagnifierType magnifier_type =
@@ skipping 10 matching lines @@
 #endif
   ash::Shell::GetPrimaryRootWindow()->GetHost()->Show();
 }
 
 void CloseAsh() {
   if (ash::Shell::HasInstance())
     ash::Shell::DeleteInstance();
 }
 
 }  // namespace chrome