[Material][Mac] Update Omnibox bubble decorations

chrome/browser/ui/cocoa/location_bar/location_bar_decoration.mm

Index: chrome/browser/ui/cocoa/location_bar/location_bar_decoration.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/location_bar_decoration.mm b/chrome/browser/ui/cocoa/location_bar/location_bar_decoration.mm
index e5f4677ed01d91f057238f42a61cf7b98bf3972d..8d346360d0b199685ed0200dda2c435910bab4cc 100644
--- a/chrome/browser/ui/cocoa/location_bar/location_bar_decoration.mm
+++ b/chrome/browser/ui/cocoa/location_bar/location_bar_decoration.mm
@@ -12,6 +12,15 @@
 #include "ui/gfx/image/image_skia_util_mac.h"
 #include "ui/gfx/paint_vector_icon.h"
 
+namespace {
+
+// Color values for the Material bubble decoration divider.
+const CGFloat kMaterialDividerAlpha = 38.0;
+const CGFloat kMaterialDividerGrayScale = 0.0;
+const CGFloat kMaterialDividerIncognitoGrayScale = 1.0;
+
+}  // namespace
+
 const CGFloat LocationBarDecoration::kOmittedWidth = 0.0;
 
 bool LocationBarDecoration::IsVisible() const {
@@ -130,6 +139,14 @@ SkColor LocationBarDecoration::GetMaterialIconColor(
                               : gfx::kChromeIconGrey;
 }
 
+NSColor* LocationBarDecoration::GetDividerColor(
+    bool location_bar_is_dark) const {
+  CGFloat gray_scale = location_bar_is_dark ? kMaterialDividerIncognitoGrayScale
+                                            : kMaterialDividerGrayScale;
+  return [NSColor colorWithCalibratedWhite:gray_scale
+                                     alpha:kMaterialDividerAlpha / 255.0];
+}
+
 gfx::VectorIconId LocationBarDecoration::GetMaterialVectorIconId() const {
   NOTREACHED();
   return gfx::VectorIconId::VECTOR_ICON_NONE;