[Mac] Adjust omnibox decoration dragging to keep image under mouse.

chrome/browser/cocoa/location_bar/bubble_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.
 
 #import "chrome/browser/cocoa/location_bar/bubble_decoration.h"
 
 #include "base/logging.h"
 #import "chrome/browser/cocoa/image_utils.h"
 
 namespace {
@@ skipping 25 matching lines @@
     return kOmittedWidth;
 
   const CGFloat image_width = image ? [image size].width : 0.0;
   if (!label)
     return kBubblePadding + image_width;
 
   const CGFloat label_width = [label sizeWithAttributes:attributes_].width;
   return kBubblePadding + image_width + label_width;
 }
 
+NSRect BubbleDecoration::GetImageRectInFrame(NSRect frame) {
+  NSRect imageRect = NSInsetRect(frame, 0.0, kKeywordYInset);
+  if (image_)
+    imageRect.size = [image_ size];
+  return imageRect;
+}
+
 CGFloat BubbleDecoration::GetWidthForSpace(CGFloat width) {
   const CGFloat all_width = GetWidthForImageAndLabel(image_, label_);
   if (all_width <= width)
     return all_width;
 
   const CGFloat image_width = GetWidthForImageAndLabel(image_, nil);
   if (image_width <= width)
     return image_width;
 
   return kOmittedWidth;
@@ skipping 48 matching lines @@
     label_.reset([label copy]);
 }
 
 void BubbleDecoration::SetColors(NSColor* border_color,
                                  NSColor* background_color,
                                  NSColor* text_color) {
   border_color_.reset([border_color retain]);
   background_color_.reset([background_color retain]);
   text_color_.reset([text_color retain]);
 }