Make drawing consistent with webkit wrt default colors and effects

gfx/native_theme_linux.cc

 // 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 "gfx/native_theme_linux.h"
 
 #include "base/logging.h"
 #include "gfx/size.h"
 #include "gfx/rect.h"
 
 namespace gfx {
 
 unsigned int NativeThemeLinux::button_length_ = 14;
 unsigned int NativeThemeLinux::scrollbar_width_ = 15;
-unsigned int NativeThemeLinux::thumb_inactive_color_ = 0xf0ebe5;
-unsigned int NativeThemeLinux::thumb_active_color_ = 0xfaf8f5;
-unsigned int NativeThemeLinux::track_color_ = 0xe3ddd8;
+unsigned int NativeThemeLinux::thumb_inactive_color_ = 0xeaeaea;
+unsigned int NativeThemeLinux::thumb_active_color_ = 0xf4f4f4;
+unsigned int NativeThemeLinux::track_color_ = 0xd3d3d3;
 
 #if !defined(OS_CHROMEOS)
 // Chromeos has a different look.
 // static
 NativeThemeLinux* NativeThemeLinux::instance() {
   // The global NativeThemeLinux instance.
   static NativeThemeLinux s_native_theme;
   return &s_native_theme;
 }
 #endif
@@ skipping 344 matching lines @@
   // others the thickness is very unpredictable.
   //
   // So, instead of trying to approximate the system theme, we
   // instead try to compute a reasonable looking choice based on the
   // known color of the track and the thumb piece. This is difficult
   // when trying to deal both with high- and low-contrast themes,
   // and both with positive and inverted themes.
   //
   // The following code has been tested to look OK with all of the
   // default GTK themes.
-  SkScalar min_diff = Clamp((hsv1[1] + hsv2[1]) * 1.2, 0.2, 0.5);
+  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);
 }
 
 void NativeThemeLinux::SetScrollbarColors(unsigned inactive_color,
                                           unsigned active_color,
                                           unsigned track_color) const {
   thumb_inactive_color_ = inactive_color;
   thumb_active_color_ = active_color;
   track_color_ = track_color;
 }
 
 }  // namespace gfx