[Telemetry SWX] add backlight info browser test

Bug: b:158658869
Change-Id: Ifce5a5fe750ed57e3c1f2d7bb647309cc0e58c3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386800
Commit-Queue: Oleh Lamzin <lamzin@google.com>
Reviewed-by: Mahmoud Gawad <mgawad@google.com>
Cr-Commit-Position: refs/heads/master@{#803640}

chromeos/components/telemetry_extension_ui/test/telemetry_extension_ui_browsertest.cc

@@ -274,6 +274,19 @@ void TelemetryExtensionUiBrowserTest::SetUpOnMainThread() {
         chromeos::cros_healthd::mojom::MemoryResult::NewMemoryInfo(
             std::move(memory_info));
   }
+  {
+    auto backlight_info = chromeos::cros_healthd::mojom::BacklightInfo::New();
+    backlight_info->path = "/sys/backlight";
+    backlight_info->max_brightness = 536880912;
+    backlight_info->brightness = 436880912;
+
+    std::vector<chromeos::cros_healthd::mojom::BacklightInfoPtr> infos;
+    infos.push_back(std::move(backlight_info));
+
+    telemetry_info->backlight_result =
+        chromeos::cros_healthd::mojom::BacklightResult::NewBacklightInfo(
+            std::move(infos));
+  }
 
   DCHECK(chromeos::cros_healthd::FakeCrosHealthdClient::Get());
 

chromeos/components/telemetry_extension_ui/test/untrusted_browsertest.js

@@ -233,6 +233,13 @@ UNTRUSTED_TEST('UntrustedRequestTelemetryInfo', async () => {
         availableMemoryKib: 2147571148,
         pageFaultsSinceLastBoot: 2199971148
       }
+    },
+    backlightResult: {
+      backlightInfo: [{
+        path: '/sys/backlight',
+        maxBrightness: 536880912,
+        brightness: 436880912,
+      }]
     }
   });
 });