cros: Implement cryptohome backend for pin.

chrome/browser/chromeos/extensions/quick_unlock_private/quick_unlock_private_api.h

 // Copyright 2016 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_CHROMEOS_EXTENSIONS_QUICK_UNLOCK_PRIVATE_QUICK_UNLOCK_PRIVATE_API_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_QUICK_UNLOCK_PRIVATE_QUICK_UNLOCK_PRIVATE_API_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/chrome_extension_function_details.h"
@@ skipping 33 matching lines @@
   DECLARE_EXTENSION_FUNCTION("quickUnlockPrivate.getActiveModes",
                              QUICKUNLOCKPRIVATE_GETACTIVEMODES);
 
  protected:
   ~QuickUnlockPrivateGetActiveModesFunction() override;
 
   // ExtensionFunction overrides.
   ResponseAction Run() override;
 
  private:
+  void OnGetActiveModes(
+      const std::vector<api::quick_unlock_private::QuickUnlockMode>& modes);
+
   ChromeExtensionFunctionDetails chrome_details_;
 
   DISALLOW_COPY_AND_ASSIGN(QuickUnlockPrivateGetActiveModesFunction);
 };
 
 class QuickUnlockPrivateCheckCredentialFunction
     : public UIThreadExtensionFunction {
  public:
   QuickUnlockPrivateCheckCredentialFunction();
   DECLARE_EXTENSION_FUNCTION("quickUnlockPrivate.checkCredential",
@@ skipping 56 matching lines @@
  protected:
   ~QuickUnlockPrivateSetModesFunction() override;
 
   // ExtensionFunction overrides.
   ResponseAction Run() override;
 
   // AuthStatusConsumer overrides.
   void OnAuthFailure(const chromeos::AuthFailure& error) override;
   void OnAuthSuccess(const chromeos::UserContext& user_context) override;
 
-  void ApplyModeChange();
+  // Continuation of OnAuthSuccess after active modes have been fetched.
+  void OnGetActiveModesAfterAuthSuccess(
+      const chromeos::UserContext& user_context,
+      const std::vector<api::quick_unlock_private::QuickUnlockMode>& modes);
+
+  // Apply any changes specified in |params_|. Returns the new active modes.
+  std::vector<api::quick_unlock_private::QuickUnlockMode> ApplyModeChange(

[achuithb, 2017/05/13 01:01:57]

Is it worthwhile using a typedef for this?

[jdufault, 2017/06/06 18:17:06]

Done.

+      const chromeos::UserContext& user_context);
 
  private:
   void FireEvent(const std::vector<QuickUnlockMode>& modes);
 
   ChromeExtensionFunctionDetails chrome_details_;
   scoped_refptr<chromeos::ExtendedAuthenticator> extended_authenticator_;
   std::unique_ptr<api::quick_unlock_private::SetModes::Params> params_;
 
   AuthenticatorAllocator authenticator_allocator_;
   ModesChangedEventHandler modes_changed_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(QuickUnlockPrivateSetModesFunction);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_QUICK_UNLOCK_PRIVATE_QUICK_UNLOCK_PRIVATE_API_H_