Conditionally draw a bezel below text fields, used for the omnibox....

chrome/browser/cocoa/styled_text_field_cell.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 "chrome/browser/cocoa/styled_text_field_cell.h"
 
 #include "app/resource_bundle.h"
 #include "base/logging.h"
 #include "chrome/browser/browser_theme_provider.h"
 #import "chrome/browser/cocoa/themed_window.h"
@@ skipping 67 matching lines @@
 @implementation StyledTextFieldCell
 
 - (CGFloat)baselineAdjust {
   return 0.0;
 }
 
 - (CGFloat)cornerRadius {
   return 0.0;
 }
 
+- (BOOL)shouldDrawBezel {
+  return NO;
+}
+
 // Returns the same value as textCursorFrameForFrame, but does not call it
 // directly to avoid potential infinite loops.
 - (NSRect)textFrameForFrame:(NSRect)cellFrame {
   return NSInsetRect(cellFrame, 0, [self baselineAdjust]);
 }
 
 // Returns the same value as textFrameForFrame, but does not call it directly to
 // avoid potential infinite loops.
 - (NSRect)textCursorFrameForFrame:(NSRect)cellFrame {
   return NSInsetRect(cellFrame, 0, [self baselineAdjust]);
@@ skipping 61 matching lines @@
   // outer border line on the bottom and right.  The clipping change
   // will clip the bottom and right edges (and corner).
   {
     ScopedSaveGraphicsState state;
     [RectPathWithInset(frame, 1.0, radius) addClip];
     const NSRect shadowFrame = NSOffsetRect(frame, 0.5, 0.5);
     NSColor* shadowShade = [NSColor colorWithCalibratedWhite:0.0 alpha:0.05];
     FrameRectWithInset(shadowFrame, 0.5, radius - 0.5, 1.0, shadowShade);
   }
 
+  // Draw optional bezel below bottom stroke.
+  if ([self shouldDrawBezel]) {
+    [[NSColor colorWithCalibratedWhite:0.96 alpha:1.0] set];
+    NSRect bezelRect = NSMakeRect(cellFrame.origin.x,
+                                  NSMaxY(cellFrame) - 0.5,
+                                  NSWidth(cellFrame),
+                                  1.0);
+    bezelRect = NSInsetRect(bezelRect, radius - 0.5, 0.0);
+    NSFrameRect(bezelRect);
+  }
+
   // Draw the focus ring if needed.
   if ([self showsFirstResponder]) {
     NSColor* color =
         [[NSColor keyboardFocusIndicatorColor] colorWithAlphaComponent:0.5];
     FrameRectWithInset(frame, 0.0, radius, 2.0, color);
   }
 
   [self drawInteriorWithFrame:cellFrame inView:controlView];
 }
 
 @end