Cross-process iframe accessibility.

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index 1d050d64db3fe11630536a54f5dd110280aadede..c73f538809ab8e27d407a6aab904227ffdece192 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -249,6 +249,15 @@ bool RenderWidgetHostViewChildFrame::LockMouse() {
 void RenderWidgetHostViewChildFrame::UnlockMouse() {
 }
 
+void RenderWidgetHostViewChildFrame::
+    CreateBrowserAccessibilityManagerIfNeeded() {
+  if (GetBrowserAccessibilityManager())
+    return;
+
+  SetBrowserAccessibilityManager(BrowserAccessibilityManager::Create(
+      BrowserAccessibilityManager::GetEmptyDocument(), host_));
+}
+
 #if defined(OS_MACOSX)
 void RenderWidgetHostViewChildFrame::SetActive(bool active) {
 }