One AXObjectCache per frame

Source/web/ChromeClientImpl.cpp

Index: Source/web/ChromeClientImpl.cpp
diff --git a/Source/web/ChromeClientImpl.cpp b/Source/web/ChromeClientImpl.cpp
index b5c25af063f53929afcaa2bd79270c72442be272..0cb3fd3ba3775d6a0fbe197e145ab7c7e84e74dc 100644
--- a/Source/web/ChromeClientImpl.cpp
+++ b/Source/web/ChromeClientImpl.cpp
@@ -211,6 +211,8 @@ void ChromeClientImpl::focusedFrameChanged(LocalFrame* frame)
     WebLocalFrameImpl* webframe = WebLocalFrameImpl::fromFrame(frame);
     if (webframe && webframe->client())
         webframe->client()->frameFocused();
+
+    m_webView->client()->focusedFrameChanged();

[dcheng, 2015/09/17 21:54:08]

How come we can't just piggyback off the WebFrameClient notification?

Also, is it possible for WebViewClient to ever be null here?

[dmazzoni, 2015/09/17 22:11:57]

That goes to only the frame that got focus.

To avoid ambiguity and race conditions, I've decided to let the main frame send
the accessible notification that the focused frame has changed.

When the frame that gets focus isn't local, |frame| will be null but this
function still gets called. In that case the WebFrameClient notification won't
get called because it's not local.
Not that I'm aware of. Other uses of m_webView->client() don't do any null
checks.

 }
 
 namespace {