ATK accessibility support for web content on Aura Linux.

content/browser/accessibility/browser_accessibility_manager.h

Index: content/browser/accessibility/browser_accessibility_manager.h
diff --git a/content/browser/accessibility/browser_accessibility_manager.h b/content/browser/accessibility/browser_accessibility_manager.h
index 21391ca71ff80862786d4fc5c378cf486277a323..3dd3e8705dfc3558a94784b103488e366862a9e8 100644
--- a/content/browser/accessibility/browser_accessibility_manager.h
+++ b/content/browser/accessibility/browser_accessibility_manager.h
@@ -25,9 +25,10 @@ class BrowserAccessibility;
 class BrowserAccessibilityManager;
 #if defined(OS_ANDROID)
 class BrowserAccessibilityManagerAndroid;
-#endif
-#if defined(OS_WIN)
+#elif defined(OS_WIN)
 class BrowserAccessibilityManagerWin;
+#elif defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(USE_X11)
+class BrowserAccessibilityManagerAuraLinux;
 #endif
 
 // For testing.
@@ -229,6 +230,11 @@ class CONTENT_EXPORT BrowserAccessibilityManager : public ui::AXTreeDelegate {
   BrowserAccessibilityManagerAndroid* ToBrowserAccessibilityManagerAndroid();
 #endif
 
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(USE_X11)
+  BrowserAccessibilityManagerAuraLinux*
+      ToBrowserAccessibilityManagerAuraLinux();
+#endif
+
   // Return the object that has focus, if it's a descandant of the
   // given root (inclusive). Does not make a new reference.
   virtual BrowserAccessibility* GetFocus(BrowserAccessibility* root);