Add signin metrics access points used on iOS.

tools/metrics/actions/actions.xml

Index: tools/metrics/actions/actions.xml
diff --git a/tools/metrics/actions/actions.xml b/tools/metrics/actions/actions.xml
index dff0ac16ce9ab5efd528ca56a12d386e45ca85a5..f15728a18076532e1c9541e1f58e1864b4eee330 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -13683,6 +13683,13 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="Signin_Impression_FromReSigninInfobar">
+  <owner>bzanotti@chromium.org</owner>
+  <description>
+    Recorded when showing sign in entry in the re-signin infobar.
+  </description>
+</action>
+
 <action name="Signin_Impression_FromRecentTabs">
   <owner>gogerald@chromium.org</owner>
   <description>
@@ -13705,6 +13712,13 @@ should be able to be added at any place in this file.
   <obsolete>Removed from codebase.</obsolete>
 </action>
 
+<action name="Signin_Impression_FromTabSwitcher">
+  <owner>bzanotti@chromium.org</owner>
+  <description>
+    Recorded when showing sign in entry in the tab switcher.
+  </description>
+</action>
+
 <action name="Signin_MoreButton_Shown">
   <owner>gogerald@chromium.org</owner>
   <owner>bzanotti@chromium.org</owner>
@@ -13856,6 +13870,14 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="Signin_Signin_FromReSigninInfobar">
+  <owner>bzanotti@chromium.org</owner>
+  <description>
+    Recorded on sign in start from access point
+    signin_metrics::AccessPoint::ACCESS_POINT_RESIGNIN_INFOBAR.
+  </description>
+</action>
+
 <action name="Signin_Signin_FromRecentTabs">
   <owner>gogerald@chromium.org</owner>
   <description>
@@ -13896,6 +13918,14 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="Signin_Signin_FromTabSwitcher">
+  <owner>bzanotti@chromium.org</owner>
+  <description>
+    Recorded on sign in start from access point
+    signin_metrics::AccessPoint::ACCESS_POINT_TAB_SWITCHER.
+  </description>
+</action>
+
 <action name="Signin_Signin_FromUnknownAccessPoint">
   <owner>gogerald@chromium.org</owner>
   <description>