[Mac] Hover/Pressed background for the Omnibox decorations

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

Index: chrome/browser/ui/cocoa/location_bar/bubble_decoration.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/bubble_decoration.mm b/chrome/browser/ui/cocoa/location_bar/bubble_decoration.mm
index 714e4b291917a7a7243fea6be34e115729fa0506..8f8db5aecf9dbb2a695a52b186a4265861376621 100644
--- a/chrome/browser/ui/cocoa/location_bar/bubble_decoration.mm
+++ b/chrome/browser/ui/cocoa/location_bar/bubble_decoration.mm
@@ -31,6 +31,12 @@ const CGFloat kIconLabelPadding = 4.0;
 // Inset for the image frame.
 const CGFloat kImageFrameYInset = 4.0;
 
+// Inset for the background frame.
+const CGFloat kBackgroundFrameYInset = 2.0;
+
+// Left margin for the background frame.
+const CGFloat kBackgroundFrameLeftMargin = 1.0;
+
 }  // namespace
 
 BubbleDecoration::BubbleDecoration() : retina_baseline_offset_(0) {
@@ -93,6 +99,13 @@ CGFloat BubbleDecoration::GetWidthForSpace(CGFloat width) {
   return kOmittedWidth;
 }
 
+NSRect BubbleDecoration::GetBackgroundFrame(NSRect frame) {
+  NSRect background_frame = NSInsetRect(frame, 0.0, kBackgroundFrameYInset);
+  background_frame.origin.x += kBackgroundFrameLeftMargin;
+  background_frame.size.width -= kDividerPadding;
+  return background_frame;
+}
+
 void BubbleDecoration::DrawInFrame(NSRect frame, NSView* control_view) {
   const NSRect decoration_frame = NSInsetRect(frame, 0.0, kImageFrameYInset);
   CGFloat text_offset = NSMinX(decoration_frame);