Cross-process iframe accessibility.

content/common/accessibility_messages.h

Index: content/common/accessibility_messages.h
diff --git a/content/common/accessibility_messages.h b/content/common/accessibility_messages.h
index adb528426895405ec0945f8da1c2753a6f58a550..ea33ffb484fba8942835e12b269327b525f247ee 100644
--- a/content/common/accessibility_messages.h
+++ b/content/common/accessibility_messages.h
@@ -51,10 +51,15 @@ IPC_STRUCT_TRAITS_BEGIN(ui::AXTreeUpdate)
   IPC_STRUCT_TRAITS_MEMBER(nodes)
 IPC_STRUCT_TRAITS_END()
 
+typedef std::map<int32, int> FrameIDMap;
+
 IPC_STRUCT_BEGIN(AccessibilityHostMsg_EventParams)
   // The tree update.
   IPC_STRUCT_MEMBER(ui::AXTreeUpdate, update)
 
+  // Mapping from node id to frame routing id for an out-of-process iframe.

[Charlie Reis, 2014/08/21 19:23:27]

Are these frame routing IDs from RenderFrames or RenderFrameProxies?  (I would
expect the latter for OOPIFs, since we won't have RenderFrames for them.)

[dmazzoni, 2014/08/25 06:49:36]

Clarified.

I think it's useful to have both - you never know when a RenderFrame is going to
suddenly go out-of-process, and if we've already looked up the frame tree node
id on the browser side, we can work with it right away rather than waiting until
we get the notification of the RenderFrameProxy routing id.

+  IPC_STRUCT_MEMBER(FrameIDMap, frame_routing_ids)
+
   // Type of event.
   IPC_STRUCT_MEMBER(ui::AXEvent, event_type)