[Mac]Implement ViewID support.

chrome/browser/cocoa/reload_button.mm

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/cocoa/reload_button.h"
 
 #include "base/nsimage_cache_mac.h"
 #include "chrome/app/chrome_dll_resource.h"
+#import "chrome/browser/cocoa/view_id_util.h"
 
 namespace {
 
 NSString* const kReloadImageName = @"reload_Template.pdf";
 NSString* const kStopImageName = @"stop_Template.pdf";
 
 }  // namespace
 
 @implementation ReloadButton
 
@@ skipping 24 matching lines @@
                             userInfo:nil]);
   [self addTrackingArea:trackingArea_];
 }
 
 - (void)awakeFromNib {
   [self updateTrackingAreas];
 
   // Don't allow multi-clicks, because the user probably wouldn't ever
   // want to stop+reload or reload+stop.
   [self setIgnoresMultiClick:YES];
+  [self setCommand:IDC_RELOAD];
 }
 
 - (void)setIsLoading:(BOOL)isLoading force:(BOOL)force {
   pendingReloadMode_ = NO;
 
   // Can always transition to stop mode.  Only transition to reload
   // mode if forced or if the mouse isn't hovering.  Otherwise, note
   // that reload mode is desired and make no change.
   if (isLoading) {
     [self setImage:nsimage_cache::ImageNamed(kStopImageName)];
-    [self setTag:IDC_STOP];
+    [self setCommand:IDC_STOP];
   } else if (force || ![self isMouseInside]) {
     [self setImage:nsimage_cache::ImageNamed(kReloadImageName)];
-    [self setTag:IDC_RELOAD];
-  } else if ([self tag] == IDC_STOP) {
+    [self setCommand:IDC_RELOAD];
+  } else if ([self command] == IDC_STOP) {
     pendingReloadMode_ = YES;
   }
 }
 
 - (BOOL)sendAction:(SEL)theAction to:(id)theTarget {
-  if ([self tag] == IDC_STOP) {
+  if ([self command] == IDC_STOP) {
     // The stop command won't be valid after the attempt to change
     // back to reload.  But it "worked", so short-circuit it.
     const BOOL ret =
         pendingReloadMode_ ? YES : [super sendAction:theAction to:theTarget];
 
     // When the stop is processed, immediately change to reload mode,
     // even though the IPC still has to bounce off the renderer and
     // back before the regular |-setIsLoaded:force:| will be called.
     // [This is how views and gtk do it.]
     if (ret)
@@ skipping 14 matching lines @@
 
   // Reload mode was requested during the hover.
   if (pendingReloadMode_)
     [self setIsLoading:NO force:YES];
 }
 
 - (BOOL)isMouseInside {
   return trackingArea_ && isMouseInside_;
 }
 
+// Tag is used solely for ViewID. Override to prevent changing of it.
+- (NSInteger)tag {
+  return view_id_util::ViewIDToTag(VIEW_ID_RELOAD_BUTTON);
+}
+
 @end  // ReloadButton
 
 @implementation ReloadButton (Testing)
 
 - (NSTrackingArea*)trackingArea {
   return trackingArea_;
 }
 
 @end