Use chromeos accelerometer reader and support only lid accelerometer.

chrome/browser/ui/ash/ash_init.cc

Index: chrome/browser/ui/ash/ash_init.cc
diff --git a/chrome/browser/ui/ash/ash_init.cc b/chrome/browser/ui/ash/ash_init.cc
index 78e617b9c0ad23c98f3f79c145c76260ff6e4473..1adf2f57d1744b851e5f05f48f9c73011d078615 100644
--- a/chrome/browser/ui/ash/ash_init.cc
+++ b/chrome/browser/ui/ash/ash_init.cc
@@ -71,11 +71,9 @@ void OpenAsh(gfx::AcceleratedWidget remote_window) {
   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FILE thread is obsolete and we should use BlockingPool.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());