bug 624163 - IME input does not work in rich editors with e10s r=dougt

dom/ipc/TabParent.cpp

@@ -527,6 +527,9 @@ TabParent::RecvGetIMEEnabled(PRUint32* aValue)
 bool
 TabParent::RecvSetInputMode(const PRUint32& aValue, const nsString& aType, const nsString& aAction, const PRUint32& aReason)
 {
+  // mIMETabParent (which is actually static) tracks which if any TabParent has IMEFocus
+  // When the input mode is set to anything but IME_STATUS_NONE, mIMETabParent should be set to this
+  mIMETabParent = aValue & nsIContent::IME_STATUS_MASK_ENABLED ? this : nsnull;
   nsCOMPtr<nsIWidget> widget = GetWidget();
   if (!widget || !AllowContentIME())
     return true;