Bug 1053053 part.3 Notify child process's IMEStateManager of menu key event listener being installed r=smaug

dom/events/IMEStateManager.cpp

@@ -463,7 +463,16 @@ IMEStateManager::OnChangeFocusInternal(nsPresContext* aPresContext,
   bool setIMEState = true;
 
   if (newTabParent) {
-    if (focusActuallyChanging) {
+    if (aAction.mFocusChange == InputContextAction::MENU_GOT_PSEUDO_FOCUS ||
+        aAction.mFocusChange == InputContextAction::MENU_LOST_PSEUDO_FOCUS) {
+      // XXX When menu keyboard listener is being uninstalled, IME state needs
+      //     to be restored by the child process asynchronously.  Therefore,
+      //     some key events which are fired immediately after closing menu
+      //     may not be handled by IME.
+      unused << newTabParent->
+        SendMenuKeyboardListenerInstalled(sInstalledMenuKeyboardListener);
+      setIMEState = sInstalledMenuKeyboardListener;
+    } else if (focusActuallyChanging) {
       InputContext context = widget->GetInputContext();
       if (context.mIMEState.mEnabled == IMEState::DISABLED) {
         setIMEState = false;

dom/events/IMEStateManager.h

@@ -50,7 +50,14 @@ public:
    * managed by the focused content (sContent).  If the focused content isn't
    * managing another process, this returns nullptr.
    */
-  static TabParent* GetActiveTabParent() { return sActiveTabParent.get(); }
+  static TabParent* GetActiveTabParent()
+  {
+    // If menu has pseudo focus, we should ignore active child process.
+    if (sInstalledMenuKeyboardListener) {
+      return nullptr;
+    }
+    return sActiveTabParent.get();
+  }
 
   /**
    * OnTabParentDestroying() is called when aTabParent is being destroyed.

dom/ipc/PBrowser.ipdl

@@ -582,6 +582,12 @@ child:
      */
     StopIMEStateManagement();
 
+    /**
+     * MenuKeyboardListenerInstalled() is called when menu keyboard listener
+     * is installed in the parent process.
+     */
+    MenuKeyboardListenerInstalled(bool aInstalled);
+
     /**
      * @see nsIDOMWindowUtils sendMouseEvent.
      */

dom/ipc/TabChild.cpp

@@ -2207,6 +2207,13 @@ TabChild::RecvStopIMEStateManagement()
   return true;
 }
 
+bool
+TabChild::RecvMenuKeyboardListenerInstalled(const bool& aInstalled)
+{
+  IMEStateManager::OnInstalledMenuKeyboardListener(aInstalled);
+  return true;
+}
+
 bool
 TabChild::RecvMouseEvent(const nsString& aType,
                          const float&    aX,

dom/ipc/TabChild.h

@@ -530,6 +530,8 @@ protected:
     virtual bool RecvParentActivated(const bool& aActivated) override;
 
     virtual bool RecvStopIMEStateManagement() override;
+    virtual bool RecvMenuKeyboardListenerInstalled(
+                   const bool& aInstalled) override;
 
 #ifdef MOZ_WIDGET_GONK
     void MaybeRequestPreinitCamera();