[Mac][Material Design] Update Omnibox dropdown on Mac to MD

chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.h

Index: chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.h
diff --git a/chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.h b/chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.h
index 5d6c1b422f5e7d3001230cf91fe973da7ffad70e..3d2dc9bf00d22fd3f627f82397d867310a625a2e 100644
--- a/chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.h
+++ b/chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.h
@@ -32,6 +32,9 @@ class OmniboxPopupViewMac : public OmniboxPopupView,
                       NSTextField* field);
   ~OmniboxPopupViewMac() override;
 
+  // Return the OmniboxPopupViewMac background color.
+  static NSColor* BackgroundColor(bool is_dark_theme);
+
   // Overridden from OmniboxPopupView:
   bool IsOpen() const override;
   void InvalidateLine(size_t line) override {}
@@ -50,7 +53,8 @@ class OmniboxPopupViewMac : public OmniboxPopupView,
                                 size_t row) override;
 
   // Returns the NSImage that should be used as an icon for the given match.
-  NSImage* ImageForMatch(const AutocompleteMatch& match) const;
+  NSImage* ImageForMatch(const AutocompleteMatch& match,
+                         BOOL ignore_dark_theme) const;
 
   OmniboxPopupMatrix* matrix() { return matrix_; }