Don't draw if SkShader::asNewFragmentProcessor fails.

include/gpu/SkGr.h

Index: include/gpu/SkGr.h
diff --git a/include/gpu/SkGr.h b/include/gpu/SkGr.h
index 026b25685ef5c14b13ce62754cb2a1944803e144..c73701e72b2545200914a062e0682a53c66ecb6c 100644
--- a/include/gpu/SkGr.h
+++ b/include/gpu/SkGr.h
@@ -81,14 +81,14 @@ GrTexture* GrRefCachedBitmapTexture(GrContext*, const SkBitmap&, const GrTexture
 // an optimization where the color filter can be applied to the SkPaint's
 // color once while converting to GrPaint and then ignored. TODO: Remove this
 // bool and use the invariant info to automatically apply the color filter.
-void SkPaint2GrPaintNoShader(GrContext* context, GrRenderTarget*, const SkPaint& skPaint,
+bool SkPaint2GrPaintNoShader(GrContext* context, GrRenderTarget*, const SkPaint& skPaint,
                              GrColor paintColor, bool constantColor, GrPaint* grPaint);
 
 // This function is similar to skPaint2GrPaintNoShader but also converts
 // skPaint's shader to a GrFragmentProcessor if possible.
 // constantColor has the same meaning as in skPaint2GrPaintNoShader.
-void SkPaint2GrPaintShader(GrContext* context, GrRenderTarget*, const SkPaint& skPaint,
-                           const SkMatrix& viewM, bool constantColor, GrPaint* grPaint);
+bool SkPaint2GrPaint(GrContext* context, GrRenderTarget*, const SkPaint& skPaint,
+                     const SkMatrix& viewM, bool constantColor, GrPaint* grPaint);
 
 ////////////////////////////////////////////////////////////////////////////////
 // Classes