Enable import/export of passwords into/from Password Manager

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index cc509a0599a8bd449a251840758e9418a1fad353..a0f246dd3611d36b5ed5d044565cf8fe52063987 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -34944,6 +34944,12 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="PasswordManager.ExportedPasswordsPerUserInCSV">
+  <owner>xunlu@chromium.org</owner>
+  <owner>vabr@chromium.org</owner>
+  <summary>The number of passwords exported in CSV format per user.</summary>
+</histogram>
+
 <histogram name="PasswordManager.FilledCredentialWasFromAndroidApp"
     enum="PasswordManagerFilledAndroidCredentials">
   <owner>msramek@chromium.org</owner>
@@ -34985,6 +34991,22 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="PasswordManager.ImportedPasswordsPerUserInCSV">
+  <owner>xunlu@chromium.org</owner>
+  <owner>vabr@chromium.org</owner>
+  <summary>The number of passwords imported in CSV format per user</summary>
+</histogram>
+
+<histogram name="PasswordManager.ImportPasswordFromCSVResult"
+    enum="PasswordImportFromCSVResult">
+  <owner>xunlu@chromium.org</owner>
+  <owner>vabr@chromium.org</owner>
+  <summary>
+    The response code of successful or failed password import attempt from a CSV
+    file.
+  </summary>
+</histogram>
+
 <histogram name="PasswordManager.InfoBarResponse" enum="InfoBarResponse">
   <owner>vabr@chromium.org</owner>
   <obsolete>
@@ -35216,6 +35238,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="PasswordManager.StorePasswordImportedFromCSVResult"
+    enum="BooleanSuccess">
+  <owner>xunlu@chromium.org</owner>
+  <owner>vabr@chromium.org</owner>
+  <summary>
+    Whether password manager stored passwords imported from CSV file
+    successfully.
+  </summary>
+</histogram>
+
 <histogram name="PasswordManager.StoreReadyWhenWiping" enum="Boolean">
   <owner>vabr@chromium.org</owner>
   <summary>
@@ -78385,6 +78417,14 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="12" label="Generation triggered by autocomplete attributes"/>
 </enum>
 
+<enum name="PasswordImportFromCSVResult" type="int">
+  <int value="0" label="Password import succeeded"/>
+  <int value="1" label="Password import failed due to IO error"/>
+  <int value="2" label="Password import failed due to malformed CSV"/>
+  <int value="3" label="Password import failed due to missing content"/>
+  <int value="4" label="Boundary value"/>
+</enum>
+
 <enum name="PasswordManagerActionsTaken" type="int">
   <obsolete>
     Deprecated as of Chrome 32. See PasswordManagerActionsTakenWithPsl