Switch AccessibilityMode to be a bitmap

content/public/browser/browser_thread.h

Index: content/public/browser/browser_thread.h
diff --git a/content/public/browser/browser_thread.h b/content/public/browser/browser_thread.h
index 55cb62b22355d339822414f06874d2bd2695590f..d575b20e6f91e42a24f1790b208ad9392deae758 100644
--- a/content/public/browser/browser_thread.h
+++ b/content/public/browser/browser_thread.h
@@ -59,26 +59,26 @@ class CONTENT_EXPORT BrowserThread {
   // 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
@@ -88,7 +88,7 @@ class CONTENT_EXPORT BrowserThread {
     // 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