Add ES 3.0 fallback for instanced rendering

include/gpu/GrCaps.h

Index: include/gpu/GrCaps.h
diff --git a/include/gpu/GrCaps.h b/include/gpu/GrCaps.h
index 0f39a5e485708ea860de5e81ff4e4fb08d1ef555..c6b535d0bba9bad4e63eaea8004cca5ba0fa755d 100644
--- a/include/gpu/GrCaps.h
+++ b/include/gpu/GrCaps.h
@@ -277,10 +277,6 @@ public:
         return fBufferMapThreshold;
     }
 
-    bool supportsInstancedDraws() const {
-        return fSupportsInstancedDraws;
-    }
-
     bool fullClearIsFree() const { return fFullClearIsFree; }
 
     /** True in environments that will issue errors if memory uploaded to buffers 
@@ -314,7 +310,6 @@ protected:
     bool fMultisampleDisableSupport                  : 1;
     bool fUsesMixedSamples                           : 1;
     bool fPreferClientSideDynamicBuffers             : 1;
-    bool fSupportsInstancedDraws                     : 1;
     bool fFullClearIsFree                            : 1;
     bool fMustClearUploadedBufferData                : 1;