Switch AccessibilityMode to be a bitmap

content/public/browser/web_contents.h

Index: content/public/browser/web_contents.h
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index 85c430028892ca25e1a41e18b3fd549235c755ec..7b56ecf4b6d0de424da46ad635a6d45dc0f3eae1 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -240,6 +240,8 @@ class WebContents : public PageNavigator,
       gfx::NativeViewAccessible accessible_parent) = 0;
 #endif
 
+  virtual void SetRendererAccessibilityMode(bool on) = 0;

[David Tseng, 2014/01/27 22:16:06]

Why not expose this method inside of BrowserAccessibilityState?

[aboxhall, 2014/01/28 00:18:42]

I guess we could, although obviously that wouldn't replace this (since this
relates to a single WebContents). Should I do that?

[David Tseng, 2014/01/28 00:48:45]

I think we'll need both. BrowserAccessibilityState flips on everything.
I also think we'll need the generic version (SetAccessibilityMode).
Might be cleaner to just have SetAccessibilityMode.

[aboxhall, 2014/01/28 17:48:26]

On second thoughts, I might take this out for now - we will need something like
it eventually but it doesn't belong in this change. And I agree with you on just
having SetAccessibilityMode.

+
   // Tab navigation state ------------------------------------------------------
 
   // Returns the current navigation properties, which if a navigation is