- Support runtime configuration of renderer-related preferences (issue #1501).

- Persist modified user preferences including per-host zoom settings when a
  cache_path value is specified and persist_user_preferences is set to true
  via CefSettings or CefRequestContextSettings.
- Avoid the need to duplicate files from chrome/ by having CefBrowserContext
  extend Chrome's Profile class.

libcef/browser/chrome_profile_stub.h

@@ -0,0 +1,57 @@
+// Copyright (c) 2015 The Chromium Embedded Framework Authors.
+// Portions 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.
+
+// This class gathers state related to a single user profile.
+
+#ifndef CEF_LIBCEF_BROWSER_CHROME_PROFILE_STUB_H_
+#define CEF_LIBCEF_BROWSER_CHROME_PROFILE_STUB_H_
+
+#include "chrome/browser/profiles/profile.h"
+
+// This file provides a stub implementation of Chrome's Profile object for use
+// as an interop layer between CEF and files that live in chrome/.
+
+class ChromeProfileStub : public Profile {
+ public:
+  ChromeProfileStub();
+  ~ChromeProfileStub() override;
+
+ protected:
+  // Profile methods.
+  scoped_refptr<base::SequencedTaskRunner> GetIOTaskRunner() override;
+  std::string GetProfileUserName() const override;
+  ProfileType GetProfileType() const override;
+  Profile* GetOffTheRecordProfile() override;
+  void DestroyOffTheRecordProfile() override;
+  bool HasOffTheRecordProfile() override;
+  Profile* GetOriginalProfile() override;
+  bool IsSupervised() const override;
+  bool IsChild() const override;
+  bool IsLegacySupervised() const override;
+  ExtensionSpecialStoragePolicy*
+      GetExtensionSpecialStoragePolicy() override;
+  PrefService* GetOffTheRecordPrefs() override;
+  net::URLRequestContextGetter* GetRequestContextForExtensions() override;
+  net::SSLConfigService* GetSSLConfigService() override;
+  bool IsSameProfile(Profile* profile) override;
+  base::Time GetStartTime() const override;
+  base::FilePath last_selected_directory() override;
+  void set_last_selected_directory(const base::FilePath& path) override;
+  PrefProxyConfigTracker* GetProxyConfigTracker() override;
+  chrome_browser_net::Predictor* GetNetworkPredictor() override;
+  DevToolsNetworkControllerHandle*
+      GetDevToolsNetworkControllerHandle() override;
+  void ClearNetworkingHistorySince(base::Time time,
+                                   const base::Closure& completion) override;
+  GURL GetHomePage() override;
+  bool WasCreatedByVersionOrLater(const std::string& version) override;
+  void SetExitType(ExitType exit_type) override;
+  ExitType GetLastSessionExitType() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ChromeProfileStub);
+};
+
+#endif  // CEF_LIBCEF_BROWSER_CHROME_PROFILE_STUB_H_