Set AllowOverlappingViews for history overlay

chrome/browser/ui/cocoa/history_overlay_controller.mm

Index: chrome/browser/ui/cocoa/history_overlay_controller.mm
diff --git a/chrome/browser/ui/cocoa/history_overlay_controller.mm b/chrome/browser/ui/cocoa/history_overlay_controller.mm
index 35e972ac1009c110013077038bdb2cf89cc834a2..f211afc3a40cc509550b5bdfd48350f47f15f9c2 100644
--- a/chrome/browser/ui/cocoa/history_overlay_controller.mm
+++ b/chrome/browser/ui/cocoa/history_overlay_controller.mm
@@ -5,6 +5,7 @@
 #import "chrome/browser/ui/cocoa/history_overlay_controller.h"
 
 #include "base/logging.h"
+#import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #include "grit/theme_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
@@ -93,6 +94,8 @@ const CGFloat kGestureCompleteProgress = 0.3;
 }
 
 - (void)dealloc {
+  [[BrowserWindowController
+      browserWindowControllerForView:[self view]] onHistoryOverlayHidden];
   [self.view removeFromSuperview];
   [super dealloc];
 }
@@ -150,6 +153,8 @@ const CGFloat kGestureCompleteProgress = 0.3;
   [[parent_ superview] addSubview:self.view
                        positioned:NSWindowAbove
                        relativeTo:parent_];
+  [[BrowserWindowController
+      browserWindowControllerForView:[self view]] onHistoryOverlayShown];
 }
 
 - (void)dismiss {