Switch AccessibilityMode to be a bitmap

content/public/browser/browser_thread.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_THREAD_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_THREAD_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 41 matching lines @@
 // task is posted to is guaranteed to outlive the current thread, then no locks
 // are used.  You should never need to cache pointers to MessageLoops, since
 // they're not thread safe.
 class CONTENT_EXPORT BrowserThread {
  public:
   // An enumeration of the well-known threads.
   // NOTE: threads must be listed in the order of their life-time, with each
   // thread outliving every other thread below it.
   enum ID {
     // The main thread in the browser.
-    UI,
+    UI,  // 0

[jochen (gone - plz use gerrit), 2014/02/12 09:56:07]

unrelated change?

[aboxhall, 2014/02/12 18:16:57]

Debugging cruft. Will remove.

 
     // This is the thread that interacts with the database.
-    DB,
+    DB,  // 1
 
     // This is the thread that interacts with the file system.
-    FILE,
+    FILE,// 2
 
     // Used for file system operations that block user interactions.
     // Responsiveness of this thread affect users.
-    FILE_USER_BLOCKING,
+    FILE_USER_BLOCKING, // 3
 
     // Used to launch and terminate Chrome processes.
-    PROCESS_LAUNCHER,
+    PROCESS_LAUNCHER,   // 4
 
     // This is the thread to handle slow HTTP cache operations.
-    CACHE,
+    CACHE, // 5
 
     // This is the thread that processes IPC and network messages.
-    IO,
+    IO, // 6
 
     // NOTE: do not add new threads here that are only used by a small number of
     // files. Instead you should just use a Thread class and pass its
     // MessageLoopProxy around. Named threads there are only for threads that
     // are used in many places.
 
     // This identifier does not represent a thread.  Instead it counts the
     // number of well-known threads.  Insert new well-known threads before this
     // identifier.
-    ID_COUNT
+    ID_COUNT // 7
   };
 
   // These are the same methods in message_loop.h, but are guaranteed to either
   // get posted to the MessageLoop if it's still alive, or be deleted otherwise.
   // They return true iff the thread existed and the task was posted.  Note that
   // even if the task is posted, there's no guarantee that it will run, since
   // the target thread may already have a Quit message in its queue.
   static bool PostTask(ID identifier,
                        const tracked_objects::Location& from_here,
                        const base::Closure& task);
@@ skipping 167 matching lines @@
  private:
   friend class BrowserThreadImpl;
 
   BrowserThread() {}
   DISALLOW_COPY_AND_ASSIGN(BrowserThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_THREAD_H_