linux: theme scrollbars from GTK theme

Pick the color of the slider's thumbpart and rail from the GTK theme. 
We cannot match the exact visual appearance of the GTK theme, as 
rendering engines can make arbitrary changes to the actual visual 
appearance. But by sampling a representative set of pixels, we ensure 
that we will at least match the general color scheme. 

BUG=10949
patch by <markus [at] chromium>
original review: http://codereview.chromium.org/400027/show

Review URL: http://codereview.chromium.org/466080

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@34183 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 30 insertions, 0 deletions

diff --git a/chrome/browser/renderer_preferences_util.cc b/chrome/browser/renderer_preferences_util.cc
new file mode 100644
index 0000000..d3ef9a4
--- /dev/null
+++ b/chrome/browser/renderer_preferences_util.cc
@@ -0,0 +1,30 @@
+// Copyright (c) 2009 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 "chrome/browser/renderer_preferences_util.h"
+
+#include "base/singleton.h"
+#include "chrome/browser/profile.h"
+
+#if defined(OS_LINUX)
+#include "chrome/browser/gtk/gtk_theme_provider.h"
+#include "chrome/common/gtk_util.h"
+#endif
+
+namespace renderer_preferences_util {
+
+RendererPreferences GetInitedRendererPreferences(Profile* profile) {
+  RendererPreferences* prefs = Singleton<RendererPreferences>::get();
+#if defined(OS_LINUX)
+  static bool inited = false;
+  if (!inited) {
+    gtk_util::InitRendererPrefsFromGtkSettings(prefs,
+      GtkThemeProvider::GetFrom(profile)->UseGtkTheme());
+    inited = true;
+  }
+#endif
+  return *prefs;
+}
+
+}  // renderer_preferences_util