[DevTools] Handle frontend zoom similarly to tab zoom.

chrome/browser/devtools/devtools_window.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/devtools/devtools_window.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/chrome_page_zoom.h"
 #include "chrome/browser/extensions/api/debugger/debugger_api.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_web_contents_observer.h"
 #include "chrome/browser/file_select_helper.h"
 #include "chrome/browser/infobars/confirm_infobar_delegate.h"
 #include "chrome/browser/infobars/infobar.h"
 #include "chrome/browser/prefs/pref_service_syncable.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/themes/theme_properties.h"
@@ skipping 813 matching lines @@
   // Update dev tools to reflect removed dev tools window.
   BrowserWindow* inspected_window = GetInspectedBrowserWindow();
   if (inspected_window)
     inspected_window->UpdateDevTools();
   // In case of docked web_contents_, we own it so delete here.
   // Embedding DevTools window will be deleted as a result of
   // WebContentsDestroyed callback.
   delete web_contents_;
 }
 
+void DevToolsWindow::ContentsZoomChange(bool zoom_in) {
+  DCHECK(is_docked_);
+  chrome_page_zoom::Zoom(web_contents(),
+      zoom_in ? content::PAGE_ZOOM_IN : content::PAGE_ZOOM_OUT);
+}
+
 void DevToolsWindow::BeforeUnloadFired(content::WebContents* tab,
                                        bool proceed,
                                        bool* proceed_to_fire_unload) {
   if (!intercepted_page_beforeunload_) {
     // Docked devtools window closed directly.
     if (proceed) {
       content::DevToolsManager::GetInstance()->ClientHostClosing(
           frontend_host_.get());
     }
     *proceed_to_fire_unload = proceed;
@@ skipping 635 matching lines @@
   if (load_state_ == kLoadCompleted)
     LoadCompleted();
 }
 
 void DevToolsWindow::LoadCompleted() {
   Show(action_on_load_);
   action_on_load_ = DevToolsToggleAction::NoOp();
   UpdateTheme();
   AddDevToolsExtensionsToClient();
 }