implement GetAttention in top-level windows. fixes attention request for session restore, probably other stuff. b=342962 r=mento

widget/src/cocoa/nsChildView.mm

@@ -1842,7 +1842,7 @@ NS_IMETHODIMP nsChildView::SetTitle(const nsAString& title)
 
 NS_IMETHODIMP nsChildView::GetAttention(PRInt32 aCycleCount)
 {
-  [NSApp requestUserAttention:NSCriticalRequest];
+  [NSApp requestUserAttention:NSInformationalRequest];
   return NS_OK;
 }
 

widget/src/cocoa/nsCocoaWindow.h

@@ -145,6 +145,7 @@ public:
     NS_IMETHOD SetPreferredSize(PRInt32 aWidth, PRInt32 aHeight) { return NS_OK; }
     NS_IMETHOD DispatchEvent(nsGUIEvent* event, nsEventStatus & aStatus) ;
     NS_IMETHOD CaptureRollupEvents(nsIRollupListener * aListener, PRBool aDoCapture, PRBool aConsumeRollupEvent);
+    NS_IMETHOD GetAttention(PRInt32 aCycleCount);
     
     // be notified that a some form of drag event needs to go into Gecko
     virtual PRBool DragEvent(unsigned int aMessage, Point aMouseGlobal, UInt16 aKeyModifiers);

widget/src/cocoa/nsCocoaWindow.mm

@@ -911,6 +911,13 @@ NS_IMETHODIMP nsCocoaWindow::CaptureRollupEvents(nsIRollupListener * aListener,
 }
 
 
+NS_IMETHODIMP nsCocoaWindow::GetAttention(PRInt32 aCycleCount)
+{
+  [NSApp requestUserAttention:NSInformationalRequest];
+  return NS_OK;
+}
+
+
 @implementation WindowDelegate