[Mac]Implement ViewID support.

chrome/browser/cocoa/toolbar_controller_unittest.mm

Index: chrome/browser/cocoa/toolbar_controller_unittest.mm
diff --git a/chrome/browser/cocoa/toolbar_controller_unittest.mm b/chrome/browser/cocoa/toolbar_controller_unittest.mm
index c5f155dfc64ff724795a93d4b6a16595e25ddaca..23fc583f81fc7c4f1124f1d87d15475f68083cd4 100644
--- a/chrome/browser/cocoa/toolbar_controller_unittest.mm
+++ b/chrome/browser/cocoa/toolbar_controller_unittest.mm
@@ -9,6 +9,7 @@
 #include "chrome/browser/cocoa/browser_test_helper.h"
 #import "chrome/browser/cocoa/cocoa_test_helper.h"
 #import "chrome/browser/cocoa/gradient_button_cell.h"
+#import "chrome/browser/cocoa/reload_button.h"
 #import "chrome/browser/cocoa/toolbar_controller.h"
 #import "chrome/browser/cocoa/view_resizer_pong.h"
 #include "chrome/browser/pref_service.h"
@@ -150,14 +151,14 @@ TEST_F(ToolbarControllerTest, FocusLocation) {
 }
 
 TEST_F(ToolbarControllerTest, LoadingState) {
-  // In its initial state, the reload button has a tag of
+  // In its initial state, the reload button has a command of
   // IDC_RELOAD. When loading, it should be IDC_STOP.
-  NSButton* reload = [[bar_ toolbarViews] objectAtIndex:kReloadIndex];
-  EXPECT_EQ([reload tag], IDC_RELOAD);
+  ReloadButton* reload = [[bar_ toolbarViews] objectAtIndex:kReloadIndex];
+  EXPECT_EQ([reload command], IDC_RELOAD);
   [bar_ setIsLoading:YES force:YES];
-  EXPECT_EQ([reload tag], IDC_STOP);
+  EXPECT_EQ([reload command], IDC_STOP);
   [bar_ setIsLoading:NO force:YES];
-  EXPECT_EQ([reload tag], IDC_RELOAD);
+  EXPECT_EQ([reload command], IDC_RELOAD);
 }
 
 // Check that toggling the state of the home button changes the visible