From 52624b56b229e6f87b210453332f045f7d7cc4a7 Mon Sep 17 00:00:00 2001
From: Aaron Klotz <aklotz@mozilla.com>
Date: Tue, 6 Sep 2016 11:27:24 -0600
Subject: [PATCH] Bug 1297549: Part 3 - Modify Windows AccessibleWrap to get
 hwnd from TabChild under e10s; r=tbsaunde

MozReview-Commit-ID: Jn2f9EAtT8O

--HG--
extra : rebase_source : 6ee62ec6b18d22f76ce6f2b60de9b0f408a5ec92
---
 accessible/windows/msaa/AccessibleWrap.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/accessible/windows/msaa/AccessibleWrap.cpp b/accessible/windows/msaa/AccessibleWrap.cpp
index 00c1d0b82875..48fc57d5ebf0 100644
--- a/accessible/windows/msaa/AccessibleWrap.cpp
+++ b/accessible/windows/msaa/AccessibleWrap.cpp
@@ -9,6 +9,7 @@
 
 #include "Compatibility.h"
 #include "DocAccessible-inl.h"
+#include "mozilla/dom/TabChild.h"
 #include "mozilla/a11y/DocAccessibleChild.h"
 #include "mozilla/a11y/DocAccessibleParent.h"
 #include "EnumVariant.h"
@@ -1295,6 +1296,22 @@ AccessibleWrap::GetHWNDFor(Accessible* aAccessible)
     return nullptr;
   }
 
+  if (XRE_IsContentProcess()) {
+    DocAccessible* doc = aAccessible->Document();
+    if (!doc) {
+      return nullptr;
+    }
+
+    DocAccessibleChild* ipcDoc = doc->IPCDoc();
+    if (!ipcDoc) {
+      return nullptr;
+    }
+
+    auto tab = static_cast<dom::TabChild*>(ipcDoc->Manager());
+    MOZ_ASSERT(tab);
+    return reinterpret_cast<HWND>(tab->GetNativeWindowHandle());
+  }
+
   // Accessibles in child processes are said to have the HWND of the window
   // their tab is within.  Popups are always in the parent process, and so
   // never proxied, which means this is basically correct.