Re-enable advanced blend with a blacklist

src/gpu/gl/GrGLUtil.cpp

Index: src/gpu/gl/GrGLUtil.cpp
diff --git a/src/gpu/gl/GrGLUtil.cpp b/src/gpu/gl/GrGLUtil.cpp
index 5db541ca7f879435a6fa5fd4ac1dae8d524e70a9..0a71a1d4ac15736a326f1aef72d15918b358fa7a 100644
--- a/src/gpu/gl/GrGLUtil.cpp
+++ b/src/gpu/gl/GrGLUtil.cpp
@@ -148,6 +148,11 @@ void GrGLGetDriverInfo(GrGLStandard standard,
             return;
         }
     }
+
+    if (kIntel_GrGLVendor == vendor) {
+        // We presume we're on the Intel driver since it hasn't identified itself as Mesa.
+        *outDriver = kIntel_GrGLDriver;
+    }
 }
 
 GrGLVersion GrGLGetVersionFromString(const char* versionString) {