Linux Aura: get tooltip background color from theme

chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc

Index: chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc b/chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc
index 7c08b1da6742fca63b39a1a0343eb1333e6a89f1..39bbb48e4da8db5e48345babc3880daf2c5d36e5 100644
--- a/chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc
+++ b/chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc
@@ -245,7 +245,11 @@ GdkColor NativeThemeGtk2::GetSystemGdkColor(ColorId color_id) const {
     case kColorId_TextfieldSelectionBackgroundFocused:
       return GetEntryStyle()->base[GTK_STATE_SELECTED];
 
-      // Trees and Tables (implemented on GTK using the same class)
+    // Tooltips
+    case kColorId_TooltipBackground:
+      return GetWindowStyle()->bg[GTK_STATE_NORMAL];
+
+    // Trees and Tables (implemented on GTK using the same class)
     case kColorId_TableBackground:
     case kColorId_TreeBackground:
       return GetTreeStyle()->bg[GTK_STATE_NORMAL];
@@ -320,9 +324,6 @@ GdkColor NativeThemeGtk2::GetSystemGdkColor(ColorId color_id) const {
       return GdkAlphaBlend(win_style->text[GTK_STATE_SELECTED],
                            win_style->bg[GTK_STATE_SELECTED], 0x34);
     }
-    default:
-      // Fall through
-      break;
   }
 
   return SkColorToGdkColor(kInvalidColorIdColor);