Launch the following pages with new task flag.

Third-party
Google legal
System WebView

Based on the large screen design, those pages should be launched as
a new task to fulfill the new UI design.

Fix: 197701608
Fix: 197701739
Fix: 197702148
Test: Manually test the UI
Change-Id: Ia1d3a6f99a022f42dc0ee082ae3bf27f89db3cbc

src/com/android/settings/deviceinfo/legal/LegalPreferenceController.java

@@ -87,9 +87,9 @@ public abstract class LegalPreferenceController extends BasePreferenceController
         }
 
         // Replace the intent with this specific activity
-        mPreference.setIntent(new Intent().setClassName(
-                resolveInfo.activityInfo.packageName,
-                resolveInfo.activityInfo.name));
+        mPreference.setIntent(new Intent()
+                .setClassName(resolveInfo.activityInfo.packageName, resolveInfo.activityInfo.name)
+                .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
 
         mPreference.setTitle(resolveInfo.loadLabel(mPackageManager));
     }