fix(Xbox): Simplify the use of WebView2

docs/tutorials/screen-resolution-detection.md

@@ -34,17 +34,10 @@ the `WinRT access` field to `All`.
 
 ### WebView2
 
-When using a WebView2 control in a UWP app, additional steps are required in
-order to enable the screen resolution detection. First, the WebView2's user-agent
-is the same as Edge Chromium and does not contain the term "Xbox One", so it has
-to be manually added like this when initializing your WebView2:
-
-```CSharp
-webView.CoreWebView2.Settings.UserAgent += " Xbox One";
-```
-
-Also, you will need to add a special project called WinRTAdapter in your project's
-solution. This project allows WinRT APIs to be exposed in the WebView2 control.
+When using a WebView2 control in a UWP app, an additional step is required in
+order to enable the screen resolution detection. You will need to add a special
+project called WinRTAdapter in your project's solution. This project allows
+WinRT APIs to be exposed in the WebView2 control.
 You will find more information on this [here](https://learn.microsoft.com/en-us/microsoft-edge/webview2/how-to/winrt-from-js).
 Make sure you put `Windows.Media.Protection.ProtectionCapabilities`
 and `Windows.Media.Protection.ProtectionCapabilityResult` in the WinRTAdapter

lib/util/platform.js

@@ -780,46 +780,6 @@ shaka.util.Platform = class {
         shaka.log.alwaysWarn('Tizen: Error detecting screen size, default ' +
             'screen size 1920x1080.');
       }
-    } else if (Platform.isXboxOne()) {
-      maxResolution.width = 1920;
-      maxResolution.height = 1080;
-      try {
-        let winRT = undefined;
-
-        // Try to access to WinRT for WebView, if it's not defined,
-        // try to access to WinRT for WebView2, if it's not defined either,
-        // let it throw.
-        if (typeof Windows !== 'undefined') {
-          winRT = Windows;
-        } else {
-          winRT = chrome.webview.hostObjects.sync.Windows;
-        }
-
-        const protectionCapabilities =
-            new winRT.Media.Protection.ProtectionCapabilities();
-        const protectionResult =
-            winRT.Media.Protection.ProtectionCapabilityResult;
-        // isTypeSupported may return "maybe", which means the operation is not
-        // completed. This means we need to retry
-        // https://learn.microsoft.com/en-us/uwp/api/windows.media.protection.protectioncapabilityresult?view=winrt-22621
-        let result = null;
-        const type =
-            'video/mp4;codecs="hvc1,mp4a";features="decode-res-x=3840,' +
-            'decode-res-y=2160,decode-bitrate=20000,decode-fps=30,' +
-            'decode-bpc=10,display-res-x=3840,display-res-y=2160,' +
-            'display-bpc=8"';
-        const keySystem = 'com.microsoft.playready.recommendation';
-        do {
-          result = protectionCapabilities.isTypeSupported(type, keySystem);
-        } while (result === protectionResult.maybe);
-        if (result === protectionResult.probably) {
-          maxResolution.width = 3840;
-          maxResolution.height = 2160;
-        }
-      } catch (e) {
-        shaka.log.alwaysWarn('Xbox: Error detecting screen size, default ' +
-            'screen size 1920x1080.');
-      }
     } else if (Platform.isWebOS()) {
       try {
         const deviceInfo =
@@ -866,6 +826,54 @@ shaka.util.Platform = class {
         maxResolution.width = 1920;
         maxResolution.height = 1080;
       }
+    } else {
+      // For Xbox and UWP apps.
+      let winRT = undefined;
+      try {
+        // Try to access to WinRT for WebView, if it's not defined,
+        // try to access to WinRT for WebView2, if it's not defined either,
+        // let it throw.
+        if (typeof Windows !== 'undefined') {
+          winRT = Windows;
+        } else {
+          winRT = chrome.webview.hostObjects.sync.Windows;
+        }
+      } catch (e) {}
+      if (winRT) {
+        maxResolution.width = 1920;
+        maxResolution.height = 1080;
+        try {
+          const protectionCapabilities =
+              new winRT.Media.Protection.ProtectionCapabilities();
+          const protectionResult =
+              winRT.Media.Protection.ProtectionCapabilityResult;
+          // isTypeSupported may return "maybe", which means the operation
+          // is not completed. This means we need to retry
+          // https://learn.microsoft.com/en-us/uwp/api/windows.media.protection.protectioncapabilityresult?view=winrt-22621
+          let result = null;
+          const type =
+              'video/mp4;codecs="hvc1,mp4a";features="decode-res-x=3840,' +
+              'decode-res-y=2160,decode-bitrate=20000,decode-fps=30,' +
+              'decode-bpc=10,display-res-x=3840,display-res-y=2160,' +
+              'display-bpc=8"';
+          const keySystem = 'com.microsoft.playready.recommendation';
+          do {
+            result = protectionCapabilities.isTypeSupported(type, keySystem);
+          } while (result === protectionResult.maybe);
+          if (result === protectionResult.probably) {
+            maxResolution.width = 3840;
+            maxResolution.height = 2160;
+          }
+        } catch (e) {
+          shaka.log.alwaysWarn('Xbox: Error detecting screen size, default ' +
+              'screen size 1920x1080.');
+        }
+      } else if (Platform.isXboxOne()) {
+        maxResolution.width = 1920;
+        maxResolution.height = 1080;
+        shaka.log.alwaysWarn('Xbox: Error detecting screen size, default ' +
+            'screen size 1920x1080.');
+      }
     }
     return maxResolution;
   }