[Mac] Make Omnibox a little bit transparent.

Randomly chose 90% opaque.  For some reason -controlColor didn't work
right anymore for hovered background, switch to -controlHighlightColor
(which sounds closer to the point anyhow).

http://crbug.com/20679
TEST=Omnibox popup should be slightly transparent, but not annoyingly so.

Review URL: http://codereview.chromium.org/188014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25475 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 7 insertions, 3 deletions

diff --git a/chrome/browser/autocomplete/autocomplete_popup_view_mac.mm b/chrome/browser/autocomplete/autocomplete_popup_view_mac.mm
index 6cc2206..497a5bb 100644
--- a/chrome/browser/autocomplete/autocomplete_popup_view_mac.mm
+++ b/chrome/browser/autocomplete/autocomplete_popup_view_mac.mm
@@ -30,6 +30,10 @@ const CGFloat kPopupRoundingRadius = 3.5;
 // Gap between the field and the popup.
 const CGFloat kPopupFieldGap = 2.0;
 
+// How opaque the popup window should be.  This matches Windows (see
+// autocomplete_popup_contents_view.cc, kGlassPopupTransparency).
+const CGFloat kPopupAlpha = 240.0 / 255.0;
+
 // How much space to leave for the left and right margins.
 const CGFloat kLeftRightMargin = 8.0;
 
@@ -48,13 +52,13 @@ const static NSInteger kMiddleButtonNumber(2);
 
 // Background colors for different states of the popup elements.
 NSColor* BackgroundColor() {
-  return [NSColor controlBackgroundColor];
+  return [[NSColor controlBackgroundColor] colorWithAlphaComponent:kPopupAlpha];
 }
 NSColor* SelectedBackgroundColor() {
-  return [NSColor selectedControlColor];
+  return [[NSColor selectedControlColor] colorWithAlphaComponent:kPopupAlpha];
 }
 NSColor* HoveredBackgroundColor() {
-  return [NSColor controlColor];
+  return [[NSColor controlHighlightColor] colorWithAlphaComponent:kPopupAlpha];
 }
 
 // TODO(shess): These are totally unprincipled.  I experimented with