Order the GL overlays above windows if possible.

chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.h"
 
 #include <utility>
 
 #include "base/memory/scoped_nsobject.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_view.h"
 
 using content::WebContents;
 
 
 @implementation TabContentsController
 @synthesize webContents = contents_;
 
 - (id)initWithContents:(WebContents*)contents {
   if ((self = [super initWithNibName:nil bundle:nil])) {
     contents_ = contents;
@@ skipping 30 matching lines @@
   NSView* contentsNativeView = contents_->GetNativeView();
   [contentsNativeView setFrame:[contentsContainer frame]];
   if ([subviews count] == 0) {
     [contentsContainer addSubview:contentsNativeView];
   } else if ([subviews objectAtIndex:0] != contentsNativeView) {
     [contentsContainer replaceSubview:[subviews objectAtIndex:0]
                                  with:contentsNativeView];
   }
   [contentsNativeView setAutoresizingMask:NSViewWidthSizable|
                                           NSViewHeightSizable];
+  // The find bar will overlap the content's view when it comes out; inform
+  // the view.
+  contents_->GetView()->SetAllowOverlappingViews(true);
 }
 
 - (void)changeWebContents:(WebContents*)newContents {
   contents_ = newContents;
 }
 
 // Returns YES if the tab represented by this controller is the front-most.
 - (BOOL)isCurrentTab {
   // We're the current tab if we're in the view hierarchy, otherwise some other
   // tab is.
@@ skipping 19 matching lines @@
   // Calling setContentView: here removes any first responder status
   // the view may have, so avoid changing the view hierarchy unless
   // the view is different.
   if ([self webContents] != updatedContents) {
     contents_ = updatedContents;
     [self ensureContentsVisible];
   }
 }
 
 @end