Add setting to isolate zoom changes by default.

chrome/browser/ui/tabs/tab_strip_model.cc

 // Copyright (c) 2012 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/ui/tabs/tab_strip_model.h"
 
 #include <algorithm>
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/tab_contents/core_tab_helper.h"
 #include "chrome/browser/ui/tab_contents/core_tab_helper_delegate.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_delegate.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_order_controller.h"
 #include "chrome/browser/ui/tabs/tab_utils.h"
 #include "chrome/browser/ui/web_contents_sizer.h"
 #include "chrome/common/url_constants.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
+#include "components/zoom/zoom_controller.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 using base::UserMetricsAction;
 using content::WebContents;
 
 namespace {
 
 // Returns true if the specified transition is one of the types that cause the
@@ skipping 297 matching lines @@
                                                  WebContents* new_contents) {
   delegate_->WillAddWebContents(new_contents);
 
   DCHECK(ContainsIndex(index));
   WebContents* old_contents = GetWebContentsAtImpl(index);
 
   FixOpenersAndGroupsReferencing(index);
 
   contents_data_[index]->SetWebContents(new_contents);
 
+  // Notify the ZoomController of the replacement of its WebContents so that it
+  // may clone any per-tab zoom information.
+  zoom::ZoomController* zoom_controller =
+      zoom::ZoomController::FromWebContents(old_contents);
+  if (zoom_controller)
+    zoom_controller->WebContentsReplaced(new_contents);
+
   for (auto& observer : observers_)
     observer.TabReplacedAt(this, old_contents, new_contents, index);
 
   // When the active WebContents is replaced send out a selection notification
   // too. We do this as nearly all observers need to treat a replacement of the
   // selected contents as the selection changing.
   if (active_index() == index) {
     for (auto& observer : observers_)
       observer.ActiveTabChanged(old_contents, new_contents, active_index(),
                                 TabStripModelObserver::CHANGE_REASON_REPLACED);
@@ skipping 1007 matching lines @@
 
 void TabStripModel::FixOpenersAndGroupsReferencing(int index) {
   WebContents* old_contents = GetWebContentsAtImpl(index);
   for (auto& data : contents_data_) {
     if (data->group() == old_contents)
       data->set_group(contents_data_[index]->group());
     if (data->opener() == old_contents)
       data->set_opener(contents_data_[index]->opener());
   }
 }