Bug 729272 - Abandon ANGLE during WebGL init if can't provide d3d share handles - r=bjacob

content/canvas/src/WebGLContext.cpp

@@ -500,6 +500,11 @@ WebGLContext::SetDimensions(PRInt32 width, PRInt32 height)
             }
         }
     }
+
+    if (gl && gl->IsANGLE() && !gl->GetD3DShareHandle()) {
+        NS_NOTREACHED("ANGLE should always provide d3d share handles!");
+        gl = nsnull;
+    }
 #endif
 
     // try the default provider, whatever that is