Bug 1886715 - Block webgpu by default on Android. r=webgpu-reviewers,…

…jimb

Currently webgpu is enabled by default on Nightly Android. As it is
currently receiving no testing at all, we should disable it by default
by adding a blocklist entry. Adventurous souls will still be able to
enable it by setting the pref gfx.webgpu.ignore-blocklist=true.

Differential Revision: https://phabricator.services.mozilla.com/D205300

widget/android/GfxInfo.cpp

@@ -667,6 +667,14 @@ nsresult GfxInfo::GetFeatureStatusImpl(
     return NS_OK;
   }
 
+  if (aFeature == FEATURE_WEBGPU) {
+    // Ensure WebGPU is disabled by default on Android until it is better
+    // tested.
+    *aStatus = nsIGfxInfo::FEATURE_BLOCKED_DEVICE;
+    aFailureId = "FEATURE_FAILURE_WEBGPU_ANDROID";
+    return NS_OK;
+  }
+
   return GfxInfoBase::GetFeatureStatusImpl(
       aFeature, aStatus, aSuggestedDriverVersion, aDriverInfo, aFailureId, &os);
 }