Keep the app list start page isolated from the browser's default zoom.

chrome/browser/ui/app_list/start_page_service.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_UI_APP_LIST_START_PAGE_SERVICE_H_
 #define CHROME_BROWSER_UI_APP_LIST_START_PAGE_SERVICE_H_
 
 #include <stdint.h>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "base/time/default_clock.h"
 #include "chrome/browser/ui/app_list/speech_recognizer_delegate.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_observer.h"
 #include "ui/app_list/speech_ui_model_observer.h"
 
 namespace content {
+struct FrameNavigateParams;
+struct LoadCommittedDetails;
 struct SpeechRecognitionSessionPreamble;
 }
 
 namespace extensions {
 class Extension;
 }
 
 class Profile;
 
 namespace app_list {
 
 class RecommendedApps;
 class SpeechAuthHelper;
 class SpeechRecognizer;
 class StartPageObserver;
 
 // StartPageService collects data to be displayed in app list's start page
 // and hosts the start page contents.
 class StartPageService : public KeyedService,
+                         public content::WebContentsObserver,
                          public SpeechRecognizerDelegate {
  public:
   typedef std::vector<scoped_refptr<const extensions::Extension> >
       ExtensionList;
   // Gets the instance for the given profile.
   static StartPageService* Get(Profile* profile);
 
   void AddObserver(StartPageObserver* observer);
   void RemoveObserver(StartPageObserver* observer);
 
@@ skipping 51 matching lines @@
   // This class observes network change events and disables/enables voice search
   // based on network connectivity.
   class NetworkChangeObserver;
 
   void LoadContents();
   void UnloadContents();
 
   // KeyedService overrides:
   void Shutdown() override;
 
+  // contents::WebContentsObserver overrides;
+  void DidNavigateMainFrame(const content::LoadCommittedDetails& details,
+      const content::FrameNavigateParams& params) override;

[Matt Giuca, 2015/01/20 07:15:01]

Very weird wrapping; has this been clang formatted?

[benwells, 2015/01/20 07:31:09]

Oops, I thought I formatted it but turns out I didn't. Fixed.

+
   // Change the known microphone availability. |available| should be true if
   // the microphone exists and is available for use.
   void OnMicrophoneChanged(bool available);
   // Change the known network connectivity state. |available| should be true if
   // at least one network is connected to.
   void OnNetworkChanged(bool available);
   // Enables/disables voice recognition based on network and microphone state.
   void UpdateRecognitionState();
 
   Profile* profile_;
@@ skipping 21 matching lines @@
   scoped_ptr<NetworkChangeObserver> network_change_observer_;
 
   base::WeakPtrFactory<StartPageService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(StartPageService);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_START_PAGE_SERVICE_H_