Save sync password hash upon "Sign in again"

Save sync password hash when user clicks "Sign in again" button in the
account menu. This sync password hash is used to detect gaia password
reuses.

Bug: 790824
Change-Id: I420162773e03fb5b99341a6da6c96a49a2a1efba
Reviewed-on: https://chromium-review.googlesource.com/879468Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Jialiu Lin <jialiul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532126}

chrome/browser/ui/webui/signin/inline_login_handler_impl.cc

@@ -23,6 +23,7 @@
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/password_manager/password_store_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_attributes_entry.h"
 #include "chrome/browser/profiles/profile_attributes_storage.h"
@@ -51,6 +52,8 @@
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/chromium_strings.h"
 #include "components/browser_sync/profile_sync_service.h"
+#include "components/password_manager/core/browser/password_manager_metrics_util.h"
+#include "components/password_manager/core/browser/password_store.h"
 #include "components/prefs/pref_service.h"
 #include "components/signin/core/browser/about_signin_internals.h"
 #include "components/signin/core/browser/account_tracker_service.h"
@@ -230,6 +233,20 @@ void InlineSigninHelper::OnClientOAuthSuccessAndBrowserOpened(
     LocalAuth::SetLocalAuthCredentials(profile_, password_);
   }
 
+#if defined(SYNC_PASSWORD_REUSE_DETECTION_ENABLED)
+  if (!password_.empty()) {
+    scoped_refptr<password_manager::PasswordStore> password_store =
+        PasswordStoreFactory::GetForProfile(profile_,
+                                            ServiceAccessType::EXPLICIT_ACCESS);
+    if (password_store) {
+      password_store->SaveSyncPasswordHash(base::UTF8ToUTF16(password_));
+      password_manager::metrics_util::LogSyncPasswordHashChange(
+          password_manager::metrics_util::SyncPasswordHashChange::
+              SAVED_ON_CHROME_SIGNIN);
+    }
+  }
+#endif
+
   if (reason == signin_metrics::Reason::REASON_REAUTHENTICATION ||
       reason == signin_metrics::Reason::REASON_UNLOCK ||
       reason == signin_metrics::Reason::REASON_ADD_SECONDARY_ACCOUNT) {