[Mac] Change the omnibox decoration padding

chrome/browser/ui/cocoa/location_bar/image_decoration.mm

 // Copyright (c) 2010 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.
 
 #include <cmath>
 
 #import "chrome/browser/ui/cocoa/location_bar/image_decoration.h"
 
+// The amount of horizontal padding around the image.
+const CGFloat kImageHorizontalPadding = 9.0;
+
 ImageDecoration::ImageDecoration() {
 }
 
 ImageDecoration::~ImageDecoration() {
 }
 
 NSImage* ImageDecoration::GetImage() {
   return image_;
 }
 
@@ skipping 12 matching lines @@
   const CGFloat delta_width = NSWidth(frame) - [image size].width;
   const CGFloat x_inset = std::floor(delta_width / 2.0);
   return NSInsetRect(frame, x_inset, y_inset);
 }
 
 CGFloat ImageDecoration::GetWidthForSpace(CGFloat width) {
   NSImage* image = GetImage();
   if (image) {
     const CGFloat image_width = [image size].width;
     if (image_width <= width)
-      return image_width;
+      return image_width + kImageHorizontalPadding;
   }
   return kOmittedWidth;
 }
 
 void ImageDecoration::DrawInFrame(NSRect frame, NSView* control_view) {
   [GetImage() drawInRect:GetDrawRectInFrame(frame)
                 fromRect:NSZeroRect  // Entire image
                operation:NSCompositeSourceOver
                 fraction:1.0
           respectFlipped:YES
                    hints:nil];
 }