Use a list preference for the preferred rate setting

MyTracks/res/values/arrays_do_not_translate.xml

@@ -176,6 +176,18 @@ limitations under the License.
     <item>@string/sensor_type_value_zephyr</item>
     <item>@string/sensor_type_value_none</item>
   </string-array>
+  <string-array name="stats_rate_imperial_options">
+    <item>@string/description_speed_imperial</item>
+    <item>@string/description_pace_imperial</item>
+  </string-array>
+  <string-array name="stats_rate_metric_options">
+    <item>@string/description_speed_metric</item>
+    <item>@string/description_pace_metric</item>
+  </string-array>
+  <string-array name="stats_rate_values">
+    <item>@string/stats_rate_speed</item>
+    <item>@string/stats_rate_pace</item>
+  </string-array>  
   <string-array name="stats_units_options">
     <item>@string/settings_stats_units_metric</item>
     <item>@string/settings_stats_units_imperial</item>

MyTracks/res/values/do_not_translate.xml

@@ -93,6 +93,8 @@ Google은 이용자에 대한 위치정보의 이용∙제공사실을 위치정
   <string name="settings_recording_track_name_date_local_value">DATE_LOCAL</string>
   <string name="settings_recording_track_name_location_value">LOCATION</string>
   <string name="settings_recording_track_name_number_value">NUMBER</string>
+  <string name="stats_rate_pace">PACE</string>
+  <string name="stats_rate_speed">SPEED</string>
   <string name="stats_units_imperial">IMPERIAL</string>
   <string name="stats_units_metric">METRIC</string>
   <string name="track_action_end">com.google.android.apps.mytracks.END_CURRENT_TRACK</string>

MyTracks/res/values/keys.xml

@@ -34,14 +34,14 @@ limitations under the License.
   <string name="min_recording_interval_key">minRecordingInterval</string>
   <string name="recording_distance_interval_key">recordingDistanceInterval</string>
   <string name="recording_gps_accuracy_key">recordingGpsAccuracy</string>
-  <string name="report_speed_key">reportSpeed</string>
   <string name="sensor_type_key">sensorType</string>
   <string name="share_track_invite_key">shareTrackInvite</string>
   <string name="share_track_public_key">shareTrackPublic</string>
   <string name="split_frequency_key">splitFrequency</string>
+  <string name="stats_rate_key">statsRate</string>  
   <string name="stats_show_coordinate_key">statsShowCoordinate</string>
   <string name="stats_show_grade_elevation_key">statsShowGradeElevation</string>
-  <string name="stats_units_key">statsdUnits</string>
+  <string name="stats_units_key">statsUnits</string>
   <string name="track_color_mode_medium_key">trackColorModeMedium</string>
   <string name="track_color_mode_percentage_key">trackColorModePercentage</string>
   <string name="track_color_mode_slow_key">trackColorModeSlow</string>