Alternate NTP Mac: Show overlay at fixed position

chrome/browser/ui/cocoa/dev_tools_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/dev_tools_controller.h"
 
 #include <algorithm>
 
 #include <Cocoa/Cocoa.h>
 
@@ skipping 111 matching lines @@
     [self hideDevToolsContainer];
 
   devToolsWindow_ = newDevToolsWindow;
 
   if (devToolsWindow_) {
     dockSide_ = devToolsWindow_->dock_side();
     [self showDevToolsContainer];
   }
 }
 
+- (CGFloat)topContentOffset {
+  return [splitView_ topContentOffset];
+}
+
 - (void)setTopContentOffset:(CGFloat)offset {
   [splitView_ setTopContentOffset:offset];
   if ([[splitView_ subviews] count] > 1)
     [self updateDevToolsViewFrame];
 }
 
 - (void)showDevToolsContainer {
   NSArray* subviews = [splitView_ subviews];
   DCHECK_EQ([subviews count], 1u);
   WebContents* devToolsContents = devToolsWindow_->web_contents();
@@ skipping 97 matching lines @@
     return NSHeight([splitView_ frame]) - [splitView_ dividerThickness] -
         devToolsWindow_->GetMinimumHeight();
   }
 }
 
 -(void)splitViewWillResizeSubviews:(NSNotification *)notification {
   [[splitView_ window] disableScreenUpdatesUntilFlush];
 }
 
 @end