Alternate NTP: Don't hide bookmark bar on instant

chrome/browser/ui/cocoa/fast_resize_view.mm

 // Copyright (c) 2009 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 <Cocoa/Cocoa.h>
 #import "chrome/browser/ui/cocoa/fast_resize_view.h"
 
 #include "base/logging.h"
 
 @interface FastResizeView (PrivateMethods)
 // Lays out this views subviews.  If fast resize mode is on, does not resize any
 // subviews and instead pegs them to the top left.  If fast resize mode is off,
 // sets the subviews' frame to be equal to this view's bounds.
 - (void)layoutSubviews;
 @end
 
 @implementation FastResizeView
+
+@synthesize contentOffset = contentOffset_;
+
 - (void)setFastResizeMode:(BOOL)fastResizeMode {
   fastResizeMode_ = fastResizeMode;
 
   // Force a relayout when coming out of fast resize mode.
   if (!fastResizeMode_)
     [self layoutSubviews];
 }
 
 - (void)resizeSubviewsWithOldSize:(NSSize)oldSize {
   [self layoutSubviews];
 }
 
 - (void)drawRect:(NSRect)dirtyRect {
   // If we are in fast resize mode, our subviews may not completely cover our
   // bounds, so we fill with white.  If we are not in fast resize mode, we do
   // not need to draw anything.
-  if (fastResizeMode_) {
-    [[NSColor whiteColor] set];
-    NSRectFill(dirtyRect);
-  }
+  if (!fastResizeMode_)
+    return;
+
+  // Don't draw on the non-content area.
+  NSRect clipRect = [self bounds];
+  clipRect.size.height -= contentOffset_;
+  NSRectClip(clipRect);
+
+  [[NSColor whiteColor] set];
+  NSRectFill(dirtyRect);
 }
 
-
 @end
 
 @implementation FastResizeView (PrivateMethods)
 - (void)layoutSubviews {
   // There should never be more than one subview.  There can be zero, if we are
   // in the process of switching tabs or closing the window.  In those cases, no
   // layout is needed.
   NSArray* subviews = [self subviews];
   DCHECK([subviews count] <= 1);
   if ([subviews count] < 1)
     return;
 
   NSView* subview = [subviews objectAtIndex:0];
   NSRect bounds = [self bounds];
 
   if (fastResizeMode_) {
     NSRect frame = [subview frame];
     frame.origin.x = 0;
     frame.origin.y = NSHeight(bounds) - NSHeight(frame);
     [subview setFrame:frame];
   } else {
     [subview setFrame:bounds];
   }
 }
 @end