Gtk3: Add themable location bar border color

chrome/browser/themes/theme_properties.h

Index: chrome/browser/themes/theme_properties.h
diff --git a/chrome/browser/themes/theme_properties.h b/chrome/browser/themes/theme_properties.h
index 3e328d7a0c79ef8430117fb7895b226124c36325..c75ee950c9b2225a7f910f6f9c1168c1b015793f 100644
--- a/chrome/browser/themes/theme_properties.h
+++ b/chrome/browser/themes/theme_properties.h
@@ -80,6 +80,9 @@ class ThemeProperties {
   enum NotOverwritableByUserThemeProperty {
     COLOR_CONTROL_BACKGROUND = 1000,
 
+    // The color of the border drawn around the location bar.
+    COLOR_LOCATION_BAR_BORDER,
+
     // The color of the line separating the bottom of the toolbar from the
     // contents.
     COLOR_TOOLBAR_BOTTOM_SEPARATOR,