ui/gfx: Get rid of a few static variables from NativeTheme* type.

ui/gfx/native_theme_linux.cc

 // Copyright (c) 2011 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/gfx/native_theme_linux.h"
 
 #include <limits>
 
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "grit/gfx_resources.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/color_utils.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace gfx {
 
@@ skipping 17 matching lines @@
 static const SkColor kSliderThumbLightGrey = SkColorSetRGB(0xf4, 0xf2, 0xef);
 static const SkColor kSliderThumbDarkGrey = SkColorSetRGB(0xea, 0xe5, 0xe0);
 static const SkColor kSliderThumbBorderDarkGrey =
     SkColorSetRGB(0x9d, 0x96, 0x8e);
 
 // static
 const NativeTheme* NativeTheme::instance() {
   return NativeThemeLinux::instance();
 }
 
+static base::LazyInstance<NativeThemeLinux> g_native_theme(
+    base::LINKER_INITIALIZED);
+
+NativeThemeLinux::NativeThemeLinux() {
+}
+
+NativeThemeLinux::~NativeThemeLinux() {
+}
+
 #if !defined(OS_CHROMEOS)
 // Chromeos has a different look.
 // static
 const NativeThemeLinux* NativeThemeLinux::instance() {
-  // The global NativeThemeLinux instance.
-  static NativeThemeLinux s_native_theme;
-  return &s_native_theme;
+  return g_native_theme.Pointer();
 }
 #endif
 
 // Get lightness adjusted color.
-static SkColor BrightenColor(const color_utils::HSL& hsl, SkAlpha alpha,
-    double lightness_amount) {
+static SkColor BrightenColor(const color_utils::HSL& hsl,
+                             SkAlpha alpha,
+                             double lightness_amount) {
   color_utils::HSL adjusted = hsl;
   adjusted.l += lightness_amount;
   if (adjusted.l > 1.0)
     adjusted.l = 1.0;
   if (adjusted.l < 0.0)
     adjusted.l = 0.0;
 
   return color_utils::HSLToSkColor(adjusted, alpha);
 }
 
-NativeThemeLinux::NativeThemeLinux() {
-}
-
-NativeThemeLinux::~NativeThemeLinux() {
-}
-
 gfx::Size NativeThemeLinux::GetPartSize(Part part,
                                         State state,
                                         const ExtraParams& extra) const {
   switch (part) {
     case kScrollbarDownArrow:
     case kScrollbarUpArrow:
       return gfx::Size(scrollbar_width_, button_length_);
     case kScrollbarLeftArrow:
     case kScrollbarRightArrow:
       return gfx::Size(button_length_, scrollbar_width_);
@@ skipping 841 matching lines @@
   SkScalar min_diff = Clamp((hsv1[1] + hsv2[1]) * 1.2, 0.28, 0.5);
   SkScalar diff = Clamp(fabs(hsv1[2] - hsv2[2]) / 2, min_diff, 0.5);
 
   if (hsv1[2] + hsv2[2] > 1.0)
     diff = -diff;
 
   return SaturateAndBrighten(hsv2, -0.2, diff);
 }
 
 }  // namespace gfx