Add month and year to time_format.

ui/strings/ui_strings.grd

Index: ui/strings/ui_strings.grd
diff --git a/ui/strings/ui_strings.grd b/ui/strings/ui_strings.grd
index 0a4d71f117a8509ce4f66c066a4a9a423fbe13b4..39e04f5480a0e82de42f4709d2184b9fbc9ff824 100644
--- a/ui/strings/ui_strings.grd
+++ b/ui/strings/ui_strings.grd
@@ -207,6 +207,16 @@ need to be translated for each locale.-->
                {DAYS, plural, =1 {1 day and } other {# days and }}
       </message>
 
+      <message name="IDS_TIME_MONTHS"
+               desc="[ICU Syntax]">
+               {MONTGS, plural, =1 {1 month} other {# months}}

[jungshik at Google, 2017/04/11 19:01:32]

nit: MONTHS instead of MONTGS

+      </message>
+
+      <message name="IDS_TIME_YEARS"
+               desc="[ICU Syntax]">
+               {YEARS, plural, =1 {1 year} other {# years}}
+      </message>
+
       <message name="IDS_TIME_REMAINING_SECS"
                desc="Seconds remaining for a job completion. Use an abbreviated word for second(s). [ICU Syntax]">
                {SECONDS, plural, =1 {1 sec left} other {# secs left}}
@@ -237,6 +247,16 @@ need to be translated for each locale.-->
                {DAYS, plural, =1 {1 day left} other {# days left}}
       </message>
 
+      <message name="IDS_TIME_REMAINING_MONTHS"
+               desc="Months remaining for a job completion. [ICU Syntax]">
+               {MONTHS, plural, =1 {1 month left} other {# months left}}
+      </message>
+
+      <message name="IDS_TIME_REMAINING_YEARS"
+               desc="Years remaining for a job completion. [ICU Syntax]">
+               {YEARS, plural, =1 {1 year left} other {# years left}}
+      </message>
+
       <message name="IDS_TIME_ELAPSED_SECS"
                desc="Relative time in browsing history or file list. Use an abbreviated word for second(s). [ICU Syntax]">
                {SECONDS, plural, =1 {1 sec ago} other {# secs ago}}
@@ -267,6 +287,16 @@ need to be translated for each locale.-->
                {DAYS, plural, =1 {1 day ago} other {# days ago}}
       </message>
 
+      <message name="IDS_TIME_ELAPSED_MONTHS"
+               desc="Relative time in browsing history or file list. [ICU Syntax]">
+               {MONTHS, plural, =1 {1 month ago} other {# months ago}}
+      </message>
+
+      <message name="IDS_TIME_ELAPSED_YEARS"
+               desc="Relative time in browsing history or file list. [ICU Syntax]">
+               {YEARS, plural, =1 {1 year ago} other {# years ago}}
+      </message>
+
       <message name="IDS_PAST_TIME_TODAY" desc="Relative day today">
         Today
       </message>