[Mac]Implement ViewID support. (third approach)

chrome/browser/tab_contents/tab_contents_view_mac.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 <Carbon/Carbon.h>
 
 #include "chrome/browser/tab_contents/tab_contents_view_mac.h"
 
 #include <string>
 
 #import "base/chrome_application_mac.h"
 #include "chrome/browser/browser.h" // TODO(beng): this dependency is awful.
 #import "chrome/browser/cocoa/focus_tracker.h"
 #import "chrome/browser/cocoa/chrome_browser_window.h"
 #import "chrome/browser/cocoa/browser_window_controller.h"
 #include "chrome/browser/global_keyboard_shortcuts_mac.h"
 #include "chrome/browser/cocoa/sad_tab_controller.h"
 #import "chrome/browser/cocoa/web_drag_source.h"
 #import "chrome/browser/cocoa/web_drop_target.h"
+#import "chrome/browser/cocoa/view_id_util.h"
 #include "chrome/browser/renderer_host/render_view_host.h"
 #include "chrome/browser/renderer_host/render_view_host_factory.h"
 #include "chrome/browser/renderer_host/render_widget_host.h"
 #include "chrome/browser/renderer_host/render_widget_host_view_mac.h"
 #include "chrome/browser/tab_contents/render_view_context_menu_mac.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/common/notification_type.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/render_messages.h"
 #include "skia/ext/skia_utils_mac.h"
@@ skipping 293 matching lines @@
 
 @implementation TabContentsViewCocoa
 
 - (id)initWithTabContentsViewMac:(TabContentsViewMac*)w {
   self = [super initWithFrame:NSZeroRect];
   if (self != nil) {
     tabContentsView_ = w;
     dropTarget_.reset(
         [[WebDropTarget alloc] initWithTabContents:[self tabContents]]);
     [self registerDragTypes];
+    // TabContentsViewCocoa's ViewID may be changed to VIEW_ID_DEV_TOOLS_DOCKED
+    // by TabContentsController, so we can't just override -viewID method to
+    // return it.
+    view_id_util::SetID(self, VIEW_ID_TAB_CONTAINER);
   }
   return self;
 }
 
 - (void)dealloc {
+  view_id_util::UnsetID(self);
+
   // Cancel any deferred tab closes, just in case.
   [self cancelDeferredClose];
 
   // This probably isn't strictly necessary, but can't hurt.
   [self unregisterDraggedTypes];
   [super dealloc];
 }
 
 // Registers for the view for the appropriate drag types.
 - (void)registerDragTypes {
@@ skipping 110 matching lines @@
   [NSObject cancelPreviousPerformRequestsWithTarget:self
                                            selector:aSel
                                              object:nil];
 }
 
 - (void)closeTabAfterEvent {
   tabContentsView_->CloseTab();
 }
 
 @end