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

ui/base/cocoa/scoped_cg_context_smooth_fonts.h

+// 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.
+
+#ifndef UI_BASE_COCOA_SCOPED_CG_CONTEXT_SMOOTH_FONTS_H_
+#define UI_BASE_COCOA_SCOPED_CG_CONTEXT_SMOOTH_FONTS_H_
+
+#include "ui/base/ui_base_export.h"
+#include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
+
+namespace ui {
+
+// Ensures LCD font smoothing is enabled before drawing text. This allows Cocoa
+// drawing code to override a decision made by AppKit to disable font smoothing.
+// E.g. this occurs when a view is layer-backed or, since 10.8, when a view
+// returns NO from -[NSView isOpaque]. For this to look nice, there must be an
+// opaque background already drawn in the graphics context at the location of
+// the text (but it doesn't need to fill the view bounds, which is required when
+// -[NSView isOpaque] returns YES).
+class UI_BASE_EXPORT ScopedCGContextSmoothFonts {
+ public:
+  ScopedCGContextSmoothFonts();
+  ~ScopedCGContextSmoothFonts();
+
+ private:
+  gfx::ScopedNSGraphicsContextSaveGState save_state_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedCGContextSmoothFonts);
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_COCOA_SCOPED_CG_CONTEXT_SMOOTH_FONTS_H_