Bug 563850 - Add scriptable interfaces for EnterModalState et al. r+sr=jst

dom/base/nsDOMWindowUtils.cpp

@@ -1267,6 +1267,27 @@ nsDOMWindowUtils::GetVisitedDependentComputedStyle(
   return rv;
 }
 
+NS_IMETHODIMP
+nsDOMWindowUtils::EnterModalState()
+{
+  mWindow->EnterModalState();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDOMWindowUtils::LeaveModalState()
+{
+  mWindow->LeaveModalState();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDOMWindowUtils::IsInModalState(PRBool *retval)
+{
+  *retval = mWindow->IsInModalState();
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsDOMWindowUtils::GetParent()
 {

dom/interfaces/base/nsIDOMWindowUtils.idl

@@ -53,7 +53,7 @@ interface nsIDOMEvent;
 interface nsITransferable;
 interface nsIQueryContentEventResult;
 
-[scriptable, uuid(0da97f1f-ad20-43e5-9793-61df63cc9c9a)]
+[scriptable, uuid(a6dbdbc9-5564-4e52-820a-4056c698f699)]
 interface nsIDOMWindowUtils : nsISupports {
 
   /**
@@ -674,4 +674,21 @@ interface nsIDOMWindowUtils : nsISupports {
    * is no current inner window, throws NS_ERROR_NOT_AVAILABLE.
    */
   readonly attribute unsigned long long currentInnerWindowID;
+
+  /**
+   * Put the window into a state where scripts are frozen and events
+   * suppressed, for use when the window has launched a modal prompt.
+   */
+  void enterModalState();
+
+  /**
+   * Resume normal window state, where scripts can run and events are
+   * delivered.
+   */
+  void leaveModalState();
+
+  /**
+   * Is the window is in a modal state? [See enterModalState()]
+   */
+  boolean isInModalState();
 };