Rotate screen in response to accelerator or device orientation sensors.

content/browser/browser_thread_impl.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 "content/browser/browser_thread_impl.h"
 
 #include <string>
 
 #include "base/atomicops.h"
 #include "base/bind.h"
@@ skipping 196 matching lines @@
 
 NOINLINE void BrowserThreadImpl::CacheThreadRun(
     base::MessageLoop* message_loop) {
   volatile int line_number = __LINE__;
   Thread::Run(message_loop);
   CHECK_GT(line_number, 0);
 }
 
 NOINLINE void BrowserThreadImpl::IOThreadRun(base::MessageLoop* message_loop) {
   volatile int line_number = __LINE__;
+  base::ThreadRestrictions::SetIOAllowed(true);

[sky, 2014/08/13 19:49:23]

Isn't true the default?

[flackr, 2014/08/13 20:45:54]

Oops, on investigation it looks like the browser IO thread is not for IO:
https://code.google.com/p/chromium/codesearch#chromium/src/content/browser/br....
It looks like the file thread is what I want:
https://code.google.com/p/chromium/codesearch#chromium/src/content/public/bro...

   Thread::Run(message_loop);
   CHECK_GT(line_number, 0);
 }
 
 MSVC_POP_WARNING()
 MSVC_ENABLE_OPTIMIZE();
 
 void BrowserThreadImpl::Run(base::MessageLoop* message_loop) {
 #if defined(OS_ANDROID)
   // Not to reset thread name to "Thread-???" by VM, attach VM with thread name.
@@ skipping 303 matching lines @@
   AtomicWord* storage = reinterpret_cast<AtomicWord*>(
       &globals.thread_delegates[identifier]);
   AtomicWord old_pointer = base::subtle::NoBarrier_AtomicExchange(
       storage, reinterpret_cast<AtomicWord>(delegate));
 
   // This catches registration when previously registered.
   DCHECK(!delegate || !old_pointer);
 }
 
 }  // namespace content