mac: Window buttons should keep "active" view when bubbles / tabpose are open on 10.7

chrome/browser/ui/cocoa/tabpose_window.mm

Index: chrome/browser/ui/cocoa/tabpose_window.mm
diff --git a/chrome/browser/ui/cocoa/tabpose_window.mm b/chrome/browser/ui/cocoa/tabpose_window.mm
index 90672be34b60bdb453bba0a197c978bcab4530aa..928c6e935dd487f0b249385c1d3b5c622a0bcd2b 100644
--- a/chrome/browser/ui/cocoa/tabpose_window.mm
+++ b/chrome/browser/ui/cocoa/tabpose_window.mm
@@ -1196,6 +1196,12 @@ void AnimateCALayerOpacityFromTo(
  return YES;
 }
 
+// Lets the traffic light buttons on the browser window keep their "active"
+// state while an info bubble is open. Only has an effect on 10.7.
+- (BOOL)_sharesParentKeyState {
+  return YES;
+}
+
 // Handle key events that should be executed repeatedly while the key is down.
 - (void)keyDown:(NSEvent*)event {
   if (state_ == tabpose::kFadingOut)