Adds new experimental accessibility extension api to enable or disable native accessibility.

chrome/browser/accessibility/accessibility_extension_api.h

Index: chrome/browser/accessibility/accessibility_extension_api.h
diff --git a/chrome/browser/accessibility/accessibility_extension_api.h b/chrome/browser/accessibility/accessibility_extension_api.h
index 95216cb850e73a0e6fdc17b49bcf2b2f8539e7f3..d1132c00a15bc3b76f9fc5977e2f03d9e50acd16 100644
--- a/chrome/browser/accessibility/accessibility_extension_api.h
+++ b/chrome/browser/accessibility/accessibility_extension_api.h
@@ -80,6 +80,16 @@ class AccessibilitySetAccessibilityEnabledFunction
       EXPERIMENTAL_ACCESSIBILITY_SETACCESSIBILITYENABLED)
 };
 
+// API function that enables or disables web content accessibility support.
+class AccessibilitySetNativeAccessibilityEnabledFunction
+    : public SyncExtensionFunction {
+  virtual ~AccessibilitySetNativeAccessibilityEnabledFunction() {}
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION(
+      "experimental.accessibility.setNativeAccessibilityEnabled",
+      EXPERIMENTAL_ACCESSIBILITY_SETNATIVEACCESSIBILITYENABLED)
+};
+
 // API function that returns the most recent focused control.
 class AccessibilityGetFocusedControlFunction : public SyncExtensionFunction {
   virtual ~AccessibilityGetFocusedControlFunction() {}