Display "<1%" instead of "0%" on the battery usage display.

Review URL: https://codereview.chromium.org/586563002

Cr-Commit-Position: refs/heads/master@{#296096}

chrome/app/generated_resources.grd

@@ -7995,9 +7995,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_WEBSITE_SETTINGS_BATTERY_STOP_BUTTON" desc="The 'Stop' button in the Website Settings single site view dialog.">
         Stop
       </message>
-      <message name="IDS_WEBSITE_SETTINGS_BATTERY_PERCENT" desc="The percent from 0 to 100 of battery consumption from a given origin or app on the Website Settings dialog.">
+      <message name="IDS_WEBSITE_SETTINGS_BATTERY_PERCENT" desc="The percent from 1 to 100 of battery consumption from a given origin or app on the Website Settings dialog.">
         <ph name="VALUE">$1<ex>100</ex></ph>%
       </message>
+      <message name="IDS_WEBSITE_SETTINGS_BATTERY_ZERO_PERCENT" desc="The percent shown when less than 1% of battery was consumed from a given origin or app on the Website Settings dialog.">
+        &lt;1%
+      </message>
       <message name="IDS_WEBSITE_SETTINGS_ALLOWED_LIST_TITLE" desc="Label above the list of allowed origins for a given permission on the Website Settings dialog.">
         Allowed
       </message>

chrome/browser/ui/webui/options/website_settings_handler.cc

@@ -676,10 +676,16 @@ void WebsiteSettingsHandler::UpdateBatteryUsage() {
 
     base::DictionaryValue* origin_entry = new base::DictionaryValue();
     origin_entry->SetInteger("usage", it->second);
-    origin_entry->SetString(
-        "usageString",
-        l10n_util::GetStringFUTF16Int(IDS_WEBSITE_SETTINGS_BATTERY_PERCENT,
-                                      it->second));
+    if (it->second == 0) {
+      origin_entry->SetString(
+          "usageString",
+          l10n_util::GetStringUTF16(IDS_WEBSITE_SETTINGS_BATTERY_ZERO_PERCENT));
+    } else {
+      origin_entry->SetString(
+          "usageString",
+          l10n_util::GetStringFUTF16Int(IDS_WEBSITE_SETTINGS_BATTERY_PERCENT,
+                                        it->second));
+    }
     origin_entry->SetStringWithoutPathExpansion("readableName",
                                                 GetReadableName(it->first));
     power_map.SetWithoutPathExpansion(origin, origin_entry);