Add instrumentation for password autofill and Credential Manager API user flows.

tools/metrics/actions/actions.xml

 <!--
 Copyright 2014 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 file is a comprehensive list of Chrome user actions along with the owner
 and description for each user action. A user action should be tied to an actual
 action taken by a user. It should be logged immediately after a user takes the
@@ skipping 2913 matching lines @@
 <action name="CreateProfile">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="CreateShortcut">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
+<action name="CredentialManager_AccountChooser_Accepted">
+  <owner>vasilii@chromium.org</owner>
+  <description>
+    The user chose a credential via the account chooser.
+  </description>
+</action>
+
+<action name="CredentialManager_AccountChooser_Dismissed">
+  <owner>vasilii@chromium.org</owner>
+  <description>The user dismissed the account chooser.</description>
+</action>
+
+<action name="CredentialManager_Autosignin">
+  <owner>vasilii@chromium.org</owner>
+  <description>
+    The website tried to automatically sign the user in and got a credential
+    back from the browser.
+  </description>
+</action>
+
 <action name="CriticalNotificationShown">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="CriticalNotification_AutoRestart">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
@@ skipping 9225 matching lines @@
 <action name="Panel_Minimize_Caption_Click">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="Panel_Minimize_Caption_Gesture">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
+<action name="PasswordManager_Autofilled">
+  <owner>vasilii@chromium.org</owner>
+  <description>Username/password were autofilled on pageload.</description>
+</action>
+
+<action name="PasswordManager_ChoseSubdomainPassword">
+  <owner>vasilii@chromium.org</owner>
+  <description>
+    The user submitted a form with an existing credential saved for another
+    subdomain. For example, the user might have signed in on
+    https://accounts.spotify.com using a credential previously saved for
+    https://play.spotify.com.
+  </description>
+</action>
+
 <action name="PasswordManager_Disabled">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="PasswordManager_Enabled">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
+<action name="PasswordManager_LoggedInWithNewPassword">
+  <owner>vasilii@chromium.org</owner>
+  <description>
+    The user tried to log in with an existing (possibly for another subdomain)
+    credential but different password.
+  </description>
+</action>
+
+<action name="PasswordManager_LoggedInWithNewUsername">
+  <owner>vasilii@chromium.org</owner>
+  <description>
+    The user tried to log in with a completely new (possibly auto generated)
+    credential.
+  </description>
+</action>
+
+<action name="PasswordManager_LoginFailed">
+  <owner>vasilii@chromium.org</owner>
+  <description>
+        The user submitted a password form, but the website appeared to reject

[Ilya Sherman, 2016/07/14 23:40:26]

nit: Please remove the extra leading whitespace on this line.

[vasilii, 2016/07/15 09:49:31]

Done.

+    the credentials.  This action reflects the password manager component's
+    logic for whether or not to offer to save a password.  At the time of
+    writing, failure means that either the form submission was canceled with a
+    failure message, or the form submission succeeded, but the user was directed
+    back to a page that still contained a login form.
+  </description>
+</action>
+
+<action name="PasswordManager_LoginPassed">
+  <owner>vasilii@chromium.org</owner>
+  <description>
+    The user submitted a password form, the website appeared to accept the

[Ilya Sherman, 2016/07/14 23:40:26]

nit: s/form, the/form and the

[vasilii, 2016/07/15 09:49:31]

Done.

+    credentials.  This action reflects the password manager component's logic
+    for whether or not to offer to save a password.
+  </description>
+</action>
+
 <action name="PasswordManager_RemovePasswordException">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="PasswordManager_RemoveSavedPassword">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="PasswordManager_SyncCredentialShown">
   <owner>gcasto@chromium.org</owner>
   <owner>vabr@chromium.org</owner>
   <description>
     Counts the number of times a user views the saved credentials for their sync
     account.
   </description>
 </action>
 
 <action name="PasswordManager_SyncCredentialUsed">
   <owner>gcasto@chromium.org</owner>
   <owner>vabr@chromium.org</owner>
   <description>
     Counts the number of times a user submits an autofilled credential which
     matches their sync account.
   </description>
 </action>
 
+<action name="PasswordManager_UsedNonDefaultUsername">
+  <owner>vasilii@chromium.org</owner>
+  <description>
+    The user logged in with an existing credential other than the default one.
+    This results in the default credential being updated, to the credential that
+    the user most recently logged in with.
+  </description>
+</action>
+
 <action name="Paste">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="PasteAndMatchStyle">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
@@ skipping 2895 matching lines @@
 <action name="webapps.AddShortcut.Manifest">
   <owner>mlamouri@chromium.org</owner>
   <description>
     Shortcut added to the homescreen with a valid Manifest. This action will be
     recorded in addition to AppShortcut, AppShortcutApple and Bookmark actions
     to keep a trend of whether the webapp also add meta tags.
   </description>
 </action>
 
 </actions>