Aura tooltips do not move on mouse move in case of many neighboring views with the same label

ui/wm/public/tooltip_client.cc

Index: ui/wm/public/tooltip_client.cc
diff --git a/ui/wm/public/tooltip_client.cc b/ui/wm/public/tooltip_client.cc
index b47323880e956ac1fd57e9976e5fa7896ae2592e..23f4e73803ed63673cb9da60821fec036ae60775 100644
--- a/ui/wm/public/tooltip_client.cc
+++ b/ui/wm/public/tooltip_client.cc
@@ -9,6 +9,7 @@
 
 DECLARE_WINDOW_PROPERTY_TYPE(aura::client::TooltipClient*)
 DECLARE_WINDOW_PROPERTY_TYPE(base::string16*)
+DECLARE_WINDOW_PROPERTY_TYPE(void**)
 
 namespace aura {
 namespace client {
@@ -16,6 +17,7 @@ namespace client {
 DEFINE_LOCAL_WINDOW_PROPERTY_KEY(
     TooltipClient*, kRootWindowTooltipClientKey, NULL);
 DEFINE_LOCAL_WINDOW_PROPERTY_KEY(base::string16*, kTooltipTextKey, NULL);
+DEFINE_LOCAL_WINDOW_PROPERTY_KEY(void*, kTooltipIdKey, NULL);
 
 void SetTooltipClient(Window* root_window, TooltipClient* client) {
   DCHECK_EQ(root_window->GetRootWindow(), root_window);
@@ -31,6 +33,11 @@ TooltipClient* GetTooltipClient(Window* root_window) {
 
 void SetTooltipText(Window* window, base::string16* tooltip_text) {
   window->SetProperty(kTooltipTextKey, tooltip_text);
+  window->SetProperty(kTooltipIdKey, static_cast<void*>(NULL));

[sky, 2014/06/02 15:39:47]

Is this really necessary?

+}
+
+void UpdateTooltipId(Window* window, void* id) {
+  window->SetProperty(kTooltipIdKey, id);
 }
 
 const base::string16 GetTooltipText(Window* window) {
@@ -38,5 +45,9 @@ const base::string16 GetTooltipText(Window* window) {
   return string_ptr ? *string_ptr : base::string16();
 }
 
+const void* GetTooltipId(Window* window) {
+  return window->GetProperty(kTooltipIdKey);
+}
+
 }  // namespace client
 }  // namespace aura