Make Windows accessibility event firing aware of guest / child frames.

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 c0e59fa1d68548408bbe583a39e5ec8faf056fb4..765ac4d971f3e418b9de01ca2669deedbb134b90 100644
--- a/content/browser/accessibility/browser_accessibility_manager.h
+++ b/content/browser/accessibility/browser_accessibility_manager.h
@@ -75,6 +75,8 @@ class CONTENT_EXPORT BrowserAccessibilityDelegate {
   virtual gfx::NativeViewAccessible AccessibilityGetNativeViewAccessible() = 0;
   virtual BrowserAccessibilityManager* AccessibilityGetChildFrame(
       int accessibility_node_id) = 0;
+  virtual void AccessibilityGetAllChildFrames(
+      std::vector<BrowserAccessibilityManager*>* child_frames) = 0;
   virtual BrowserAccessibility* AccessibilityGetParentFrame() = 0;
 };
 
@@ -244,6 +246,11 @@ class CONTENT_EXPORT BrowserAccessibilityManager : public ui::AXTreeDelegate {
     delegate_ = delegate;
   }
 
+  // If this BrowserAccessibilityManager is a child frame or guest frame,
+  // return the BrowserAccessibilityDelegate from the highest ancestor frame
+  // in the frame tree.
+  BrowserAccessibilityDelegate* GetDelegateFromRootManager();
+
   // Get a snapshot of the current tree as an AXTreeUpdate.
   ui::AXTreeUpdate SnapshotAXTreeForTesting();