Fill is_chrome_signin_password field in the password entry pings.

components/password_manager/core/browser/password_reuse_detector_consumer.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 COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PASSWORD_REUSE_DETECTOR_CONSUMER_H_
 #define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PASSWORD_REUSE_DETECTOR_CONSUMER_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 
 namespace password_manager {
 
 // Callback interface for receiving a password reuse event.
 class PasswordReuseDetectorConsumer
     : public base::SupportsWeakPtr<PasswordReuseDetectorConsumer> {
  public:
   PasswordReuseDetectorConsumer();
   virtual ~PasswordReuseDetectorConsumer();
 
   // Called when a password reuse is found.
-  // |legitimate_domain| is the domain on which |password| is saved or the sync
-  // domain if |password| is a sync password.
+  // |legitimate_domain| is the domain on which |password| is saved or
+  // safe_browsing::kChromeSyncDomain if |password| is a sync password.

[dvadym, 2017/06/02 09:28:55]

Would it be possible to move kChromeSyncDomain to PasswordManager code, for
example to this file? It looks like kChromeSyncDomain is part of PasswordReuse
API so it's more logical to have it inside Reuse detection code. So if we decide
to use Password Reuse detection in our code, it will be not needed to add
SafeBrowsing dependencies.

[Jialiu Lin, 2017/06/06 01:00:53]

Done.
I thought I would encounter some circular dependencies. It turns out
PasswordReuseDetectionManager no longer needs to depends on
PasswordProtectionService. Constant moved to password_manager namespace. 

[dvadym, 2017/06/06 09:10:19]

Great, thanks for moving it.

   // |saved_passwords| is total number of passwords stored in Password Manager.
   // |number_matches| is a number of sites on which |password| is saved.
   virtual void OnReuseFound(const base::string16& password,
                             const std::string& legitimate_domain,
                             int saved_passwords,
                             int number_matches) = 0;
 };
 
 }  // namespace password_manager
 #endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PASSWORD_REUSE_DETECTOR_CONSUMER_H_