Allows menu host windows to be enumerated in DragTargetWindowFinder

ui/base/x/x11_util.cc

Index: ui/base/x/x11_util.cc
diff --git a/ui/base/x/x11_util.cc b/ui/base/x/x11_util.cc
index 3ba6ce77b1fc273598a39d52a554ff51e7e9314f..708f962634f47afe04eea19883b5ad341a3a4d3f 100644
--- a/ui/base/x/x11_util.cc
+++ b/ui/base/x/x11_util.cc
@@ -35,6 +35,7 @@
 #include "base/threading/thread.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkPostConfig.h"
+#include "ui/base/x/x11_menu_list.h"
 #include "ui/base/x/x11_util_internal.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/keycodes/keyboard_code_conversion_x.h"
@@ -1083,6 +1084,18 @@ bool EnumerateChildren(EnumerateWindowsDelegate* delegate, XID window,
   if (depth > max_depth)
     return false;
 
+  std::vector<XID> windows;
+  std::vector<XID>::iterator iter;
+  if (depth == 0) {
+    XMenuList::GetInstance()->InsertMenuWindowXIDs(&windows);
+    // Enumerate the menus first.
+    for (iter = windows.begin(); iter != windows.end(); iter++) {
+      if (delegate->ShouldStopIterating(*iter))
+        return true;
+    }
+    windows.clear();
+  }
+
   XID root, parent, *children;
   unsigned int num_children;
   int status = XQueryTree(gfx::GetXDisplay(), window, &root, &parent, &children,
@@ -1090,7 +1103,6 @@ bool EnumerateChildren(EnumerateWindowsDelegate* delegate, XID window,
   if (status == 0)
     return false;
 
-  std::vector<XID> windows;
   for (int i = static_cast<int>(num_children) - 1; i >= 0; i--)
     windows.push_back(children[i]);
 
@@ -1098,7 +1110,6 @@ bool EnumerateChildren(EnumerateWindowsDelegate* delegate, XID window,
 
   // XQueryTree returns the children of |window| in bottom-to-top order, so
   // reverse-iterate the list to check the windows from top-to-bottom.
-  std::vector<XID>::iterator iter;
   for (iter = windows.begin(); iter != windows.end(); iter++) {
     if (IsWindowNamed(*iter) && delegate->ShouldStopIterating(*iter))
       return true;
@@ -1134,6 +1145,7 @@ void EnumerateTopLevelWindows(ui::EnumerateWindowsDelegate* delegate) {
     ui::EnumerateAllWindows(delegate, kMaxSearchDepth);
     return;
   }
+  XMenuList::GetInstance()->InsertMenuWindowXIDs(&stack);
 
   std::vector<XID>::iterator iter;
   for (iter = stack.begin(); iter != stack.end(); iter++) {