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

content/browser/accessibility/browser_accessibility_manager.cc

Index: content/browser/accessibility/browser_accessibility_manager.cc
diff --git a/content/browser/accessibility/browser_accessibility_manager.cc b/content/browser/accessibility/browser_accessibility_manager.cc
index 0bc4260ac629c53f97b73de99dfd7371a88ace76..7e726bdb09009180812c9c8b26e021ece170381d 100644
--- a/content/browser/accessibility/browser_accessibility_manager.cc
+++ b/content/browser/accessibility/browser_accessibility_manager.cc
@@ -362,8 +362,9 @@ void BrowserAccessibilityManager::SetTextSelection(
 }
 
 gfx::Rect BrowserAccessibilityManager::GetViewBounds() {
-  if (delegate_)
-    return delegate_->AccessibilityGetViewBounds();
+  BrowserAccessibilityDelegate* delegate = GetDelegateFromRootManager();
+  if (delegate)
+    return delegate->AccessibilityGetViewBounds();
   return gfx::Rect();
 }
 
@@ -433,6 +434,19 @@ void BrowserAccessibilityManager::OnNodeChangeFinished(ui::AXNode* node) {
   GetFromAXNode(node)->OnUpdateFinished();
 }
 
+BrowserAccessibilityDelegate*
+    BrowserAccessibilityManager::GetDelegateFromRootManager() {
+  BrowserAccessibilityManager* manager = this;
+  while (manager->delegate()) {
+    BrowserAccessibility* host_node_in_parent_frame =
+        manager->delegate()->AccessibilityGetParentFrame();
+    if (!host_node_in_parent_frame)
+      break;
+    manager = host_node_in_parent_frame->manager();
+  }
+  return manager->delegate();
+}
+
 ui::AXTreeUpdate BrowserAccessibilityManager::SnapshotAXTreeForTesting() {
   scoped_ptr<ui::AXTreeSource<const ui::AXNode*> > tree_source(
       tree_->CreateTreeSource());