Mac: restore subpixel AA in the find bar when it doesn't have focus

ui/base/cocoa/scoped_cg_context_smooth_fonts.mm

Index: ui/base/cocoa/scoped_cg_context_smooth_fonts.mm
diff --git a/ui/base/cocoa/scoped_cg_context_smooth_fonts.mm b/ui/base/cocoa/scoped_cg_context_smooth_fonts.mm
new file mode 100644
index 0000000000000000000000000000000000000000..1129a19abc86c86017f12f643e9eb3d98203a225
--- /dev/null
+++ b/ui/base/cocoa/scoped_cg_context_smooth_fonts.mm
@@ -0,0 +1,20 @@
+// Copyright 2015 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 "ui/base/cocoa/scoped_cg_context_smooth_fonts.h"
+
+#import <AppKit/AppKit.h>
+
+namespace ui {
+
+ScopedCGContextSmoothFonts::ScopedCGContextSmoothFonts() {
+  NSGraphicsContext* context = [NSGraphicsContext currentContext];
+  CGContextRef cg_context = static_cast<CGContextRef>([context graphicsPort]);
+  CGContextSetShouldSmoothFonts(cg_context, true);
+}
+
+ScopedCGContextSmoothFonts::~ScopedCGContextSmoothFonts() {
+}
+
+}  // namespace ui