Omnibox UI Experiments: Port Vertical Layout experiment to Mac Cocoa.

chrome/browser/ui/cocoa/omnibox/omnibox_popup_matrix.mm

Index: chrome/browser/ui/cocoa/omnibox/omnibox_popup_matrix.mm
diff --git a/chrome/browser/ui/cocoa/omnibox/omnibox_popup_matrix.mm b/chrome/browser/ui/cocoa/omnibox/omnibox_popup_matrix.mm
index ca66db2cf4d6bc966e97f3621cdcd0225630ed8d..86a132b9df316d9063a153fe288ab4c5e0e2754c 100644
--- a/chrome/browser/ui/cocoa/omnibox/omnibox_popup_matrix.mm
+++ b/chrome/browser/ui/cocoa/omnibox/omnibox_popup_matrix.mm
@@ -4,12 +4,14 @@
 
 #import "chrome/browser/ui/cocoa/omnibox/omnibox_popup_matrix.h"
 
+#include "base/feature_list.h"
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #import "chrome/browser/ui/cocoa/omnibox/omnibox_popup_cell.h"
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.h"
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
 #include "components/omnibox/browser/autocomplete_result.h"
+#include "components/omnibox/browser/omnibox_field_trial.h"
 
 namespace {
 
@@ -106,8 +108,13 @@ const NSInteger kMiddleButtonNumber = 2;
 }
 
 - (CGFloat)tableView:(NSTableView*)tableView heightOfRow:(NSInteger)row {
-  CGFloat height = [OmniboxPopupCell getContentTextHeight];
-  if ([[array_ objectAtIndex:row] isAnswer]) {
+  BOOL isAnswer = [[array_ objectAtIndex:row] isAnswer];
+  BOOL isDoubleLine = !isAnswer && base::FeatureList::IsEnabled(
+                                       omnibox::kUIExperimentVerticalLayout);
+  CGFloat height =
+      [OmniboxPopupCell getContentTextHeightForDoubleLine:isDoubleLine];
+
+  if (isAnswer) {
     OmniboxPopupMatrix* matrix =
         base::mac::ObjCCastStrict<OmniboxPopupMatrix>(tableView);
     NSRect rowRect = [tableView rectOfColumn:0];