Add a new GetSystemColor method to native theme.

ui/gfx/native_theme_base.cc

Index: ui/gfx/native_theme_base.cc
diff --git a/ui/gfx/native_theme_base.cc b/ui/gfx/native_theme_base.cc
index 95ba5aa1e681b1856e4f246b1c6837bab2157c68..c4ea57625f61d7aa580f277af72e500bf778aa4d 100644
--- a/ui/gfx/native_theme_base.cc
+++ b/ui/gfx/native_theme_base.cc
@@ -16,6 +16,12 @@
 
 namespace gfx {
 
+namespace {
+// Hardcoded colors for use when there is no system theme (Aura, ChromeOS).
+const SkColor kDefaultDialogBackgroundColor = SkColorSetRGB(200, 200, 200);
+const SkColor kInvalidColorIdColor = SkColorSetRGB(255, 0, 128);

[James Cook, 2011/11/19 03:02:46]

I like this name better.

+}

[James Cook, 2011/11/19 03:02:46]

The style guide likes namespaces to end with two spaces and a comment:

}  // namespace

[benrg, 2011/11/21 18:32:40]

Done.

+
 unsigned int NativeThemeBase::button_length_ = 14;
 #if defined(TOUCH_UI)
 unsigned int NativeThemeBase::scrollbar_width_ = 0;
@@ -57,6 +63,19 @@ NativeThemeBase::NativeThemeBase() {
 NativeThemeBase::~NativeThemeBase() {
 }
 
+// This implementation returns hardcoded colors. It's used by NativeThemeAura
+// and NativeThemeChromeos and overridden by NativeThemeGtk.
+SkColor NativeThemeBase::GetSystemColor(ColorId color_id) const {
+  switch (color_id) {
+    case kDialogBackgroundColorId:
+      return kDefaultDialogBackgroundColor;
+    default:
+      NOTREACHED() << "Invalid color_id: " << color_id;
+      break;
+  }
+  return kInvalidColorIdColor;
+}
+
 gfx::Size NativeThemeBase::GetPartSize(Part part,
                                        State state,
                                        const ExtraParams& extra) const {