[Mac] Star as a rhs-decoration in AutocompleteTextFieldCell.

chrome/browser/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/cocoa/location_bar/image_decoration.h"
+
+#import "chrome/browser/cocoa/image_utils.h"
+
+ImageDecoration::ImageDecoration() {
+}
+
+ImageDecoration::~ImageDecoration() {
+}
+
+NSImage* ImageDecoration::GetImage() {
+  return image_;
+}
+
+void ImageDecoration::SetImage(NSImage* image) {
+  image_.reset([image retain]);
+}
+
+NSRect ImageDecoration::GetDrawRectInFrame(NSRect frame) {
+  NSImage* image = GetImage();
+  if (!image)
+    return frame;
+
+  const CGFloat delta_height = NSHeight(frame) - [image size].height;
+  const CGFloat y_inset = std::floor(delta_height / 2.0);
+  return NSInsetRect(frame, 0.0, 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 kOmittedWidth;
+}
+
+void ImageDecoration::DrawInFrame(NSRect frame, NSView* control_view) {
+  [GetImage() drawInRect:GetDrawRectInFrame(frame)
+                fromRect:NSZeroRect  // Entire image
+               operation:NSCompositeSourceOver
+                fraction:1.0
+            neverFlipped:YES];
+}