Mac: Fix renderer idle cpu usage regression.

chrome/browser/extensions/extension_host.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_host.h"
 
 #include <list>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 694 matching lines @@
   // See http://code.google.com/p/chromium/issues/detail?id=18240
   LOG(INFO) << "(RenderViewCreated) Resetting EFD to " << url_.spec() << " for "
       << extension_->name();
   extension_function_dispatcher_.reset(
       ExtensionFunctionDispatcher::Create(render_view_host, this, url_));
 
   if (extension_host_type_ == ViewType::EXTENSION_TOOLSTRIP ||
       extension_host_type_ == ViewType::EXTENSION_MOLE ||
       extension_host_type_ == ViewType::EXTENSION_POPUP ||
       extension_host_type_ == ViewType::EXTENSION_INFOBAR) {
-    render_view_host->EnablePreferredSizeChangedMode();
+    render_view_host->EnablePreferredSizeChangedMode(
+        kPreferredSizeWidth | kPreferredSizeHeightThisIsSlow);
   }
 }
 
 int ExtensionHost::GetBrowserWindowID() const {
   // Hosts not attached to any browser window have an id of -1.  This includes
   // those mentioned below, and background pages.
   int window_id = extension_misc::kUnknownWindowId;
   if (extension_host_type_ == ViewType::EXTENSION_TOOLSTRIP ||
       extension_host_type_ == ViewType::EXTENSION_MOLE ||
       extension_host_type_ == ViewType::EXTENSION_POPUP ||
       extension_host_type_ == ViewType::EXTENSION_INFOBAR) {
     // If the host is bound to a browser, then extract its window id.
     // Extensions hosted in ExternalTabContainer objects may not have
     // an associated browser.
     Browser* browser = GetBrowser();
     if (browser)
       window_id = ExtensionTabUtil::GetWindowId(browser);
   } else if (extension_host_type_ != ViewType::EXTENSION_BACKGROUND_PAGE) {
     NOTREACHED();
   }
   return window_id;
 }