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

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index e310ae240da02a3c1820458dd50150b2be3fe0ae..a86ec6ad88b1c879833c4a9cb106d7d232cb7ce1 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -452,23 +452,27 @@ BrowserAccessibilityManager* RenderFrameHostImpl::AccessibilityGetChildFrame(
     int accessibility_node_id) {
   RenderFrameHostImpl* child_frame =
       FrameAccessibility::GetInstance()->GetChild(this, accessibility_node_id);
-  if (!child_frame)
-    return NULL;
+  if (!child_frame || IsSameSiteInstance(child_frame))
+    return nullptr;
 
-  // Return NULL if this isn't an out-of-process iframe. Same-process iframes
-  // are already part of the accessibility tree.
-  if (child_frame->GetProcess()->GetID() == GetProcess()->GetID())
-    return NULL;
+  return child_frame->GetOrCreateBrowserAccessibilityManager();
+}
 
-  // As a sanity check, make sure the frame we're going to return belongs
-  // to the same BrowserContext.
-  if (GetSiteInstance()->GetBrowserContext() !=
-      child_frame->GetSiteInstance()->GetBrowserContext()) {
-    NOTREACHED();
-    return NULL;
-  }
+void RenderFrameHostImpl::AccessibilityGetAllChildFrames(
+    std::vector<BrowserAccessibilityManager*>* child_frames) {
+  std::vector<RenderFrameHostImpl*> child_frame_hosts;
+  FrameAccessibility::GetInstance()->GetAllChildFrames(
+      this, &child_frame_hosts);
+  for (size_t i = 0; i < child_frame_hosts.size(); ++i) {
+    RenderFrameHostImpl* child_frame_host = child_frame_hosts[i];
+    if (!child_frame_host || IsSameSiteInstance(child_frame_host))
+      continue;
 
-  return child_frame->GetOrCreateBrowserAccessibilityManager();
+    BrowserAccessibilityManager* manager =
+        child_frame_host->GetOrCreateBrowserAccessibilityManager();
+    if (manager)
+      child_frames->push_back(manager);
+  }
 }
 
 BrowserAccessibility* RenderFrameHostImpl::AccessibilityGetParentFrame() {
@@ -1485,6 +1489,14 @@ void RenderFrameHostImpl::UpdateGuestFrameAccessibility(
   }
 }
 
+bool RenderFrameHostImpl::IsSameSiteInstance(
+    RenderFrameHostImpl* other_render_frame_host) {
+  // As a sanity check, make sure the frame belongs to the same BrowserContext.
+  CHECK_EQ(GetSiteInstance()->GetBrowserContext(),
+           other_render_frame_host->GetSiteInstance()->GetBrowserContext());
+  return GetSiteInstance() == other_render_frame_host->GetSiteInstance();
+}
+
 void RenderFrameHostImpl::SetAccessibilityMode(AccessibilityMode mode) {
   Send(new FrameMsg_SetAccessibilityMode(routing_id_, mode));
 }