[chromeos] Add a battery discharge rate plot to about:power page.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 78ea61e7e4aa35630d71a89cd589f0898ca320ca..3e3f26105d6e6b7525ff480b392ec3332f5b6129 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -15423,9 +15423,15 @@ Do you accept?
       <message name="IDS_ABOUT_POWER_RELOAD_BUTTON" desc="Text on the reload button">
         Reload
       </message>
-      <message name="IDS_ABOUT_POWER_BATTERY_CHARGE_HEADER" desc="Header of the battery charge section">
+      <message name="IDS_ABOUT_POWER_BATTERY_CHARGE_PERCENTAGE_HEADER" desc="Header of the battery charge plot">
         Battery Charge Percentage
       </message>
+      <message name="IDS_ABOUT_POWER_BATTERY_DISCHARGE_RATE_HEADER" desc="Header of the battery discharge rate plot">
+        Battery Discharge Rate in Watts
+      </message>
+      <message name="IDS_ABOUT_POWER_NEGATIVE_DISCHARGE_RATE_INFO" desc="Describes what a negative discharge rate means">
+        Negative discharge rate means the battery is charging
+      </message>
       <message name="IDS_ABOUT_POWER_NOT_ENOUGH_DATA" desc="String to display when enough plot data is not available">
         Not enough data available yet.
       </message>