Make GrGLConfigConversionEffect work for Imagination and some other GPUs.

src/gpu/gl/GrGLUtil.h

Index: src/gpu/gl/GrGLUtil.h
diff --git a/src/gpu/gl/GrGLUtil.h b/src/gpu/gl/GrGLUtil.h
index 73fcec1177011f0220007a97a53138bea226881a..91d311160ceb3e51cb566af97841ff2b8ba73dc7 100644
--- a/src/gpu/gl/GrGLUtil.h
+++ b/src/gpu/gl/GrGLUtil.h
@@ -41,6 +41,7 @@ enum GrGLVendor {
 enum GrGLRenderer {
     kTegra2_GrGLRenderer,
     kTegra3_GrGLRenderer,
+    kPVRRogueHood_GrGLRenderer,
 
     kOther_GrGLRenderer
 };