Bug 1267879 - Only check robustness if it's supported. - r=jrmuizel

MozReview-Commit-ID: 4RNjnWFccID

gfx/gl/GLContext.cpp

@@ -1091,15 +1091,16 @@ GLContext::LoadMoreSymbols(const char* prefix, bool trygl)
         return fnLoadForFeature(list, feature);
     };
 
-    bool hasRobustness = false;
-    if (SupportsRobustness()) {
+    if (IsSupported(GLFeature::robustness)) {
+        bool hasRobustness = true;
+
         if (IsExtensionSupported(ARB_robustness)) {
             const SymLoadStruct symbols[] = {
                 { (PRFuncPtr*) &mSymbols.fGetGraphicsResetStatus, { "GetGraphicsResetStatusARB", nullptr } },
                 END_SYMBOLS
             };
-            if (fnLoadForExt(symbols, ARB_robustness)) {
-                hasRobustness = true;
+            if (!fnLoadForExt(symbols, ARB_robustness)) {
+                hasRobustness = false;
             }
         }
 
@@ -1108,13 +1109,14 @@ GLContext::LoadMoreSymbols(const char* prefix, bool trygl)
                 { (PRFuncPtr*) &mSymbols.fGetGraphicsResetStatus, { "GetGraphicsResetStatusEXT", nullptr } },
                 END_SYMBOLS
             };
-            if (fnLoadForExt(symbols, EXT_robustness)) {
-                hasRobustness = true;
+            if (!fnLoadForExt(symbols, EXT_robustness)) {
+                hasRobustness = false;
             }
         }
-    }
-    if (!hasRobustness) {
-        MarkUnsupported(GLFeature::robustness);
+
+        if (!hasRobustness) {
+            MarkUnsupported(GLFeature::robustness);
+        }
     }
 
     if (IsSupported(GLFeature::sync)) {