Don't draw if SkShader::asNewFragmentProcessor fails.

src/gpu/GrAtlasTextContext.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "GrAtlasTextContext.h"
 
 #include "GrAtlas.h"
 #include "GrBatch.h"
@@ skipping 229 matching lines @@
 
     SkIRect clipRect;
     clip.getConservativeBounds(rt->width(), rt->height(), &clipRect);
 
     SkScalar transX = 0.f;
     SkScalar transY = 0.f;
 
     // Though for the time being runs in the textblob can override the paint, they only touch font
     // info.
     GrPaint grPaint;
-    SkPaint2GrPaintShader(fContext, rt, skPaint, viewMatrix, true, &grPaint);
+    if (!SkPaint2GrPaint(fContext, rt, skPaint, viewMatrix, true, &grPaint)) {
+        return;
+    }
 
     if (cacheBlob) {
         if (MustRegenerateBlob(&transX, &transY, *cacheBlob, skPaint, blurRec, viewMatrix, x, y)) {
             // We have to remake the blob because changes may invalidate our masks.
             // TODO we could probably get away reuse most of the time if the pointer is unique,
             // but we'd have to clear the subrun information
             fCache->remove(cacheBlob);
             cacheBlob.reset(SkRef(fCache->createCachedBlob(blob, key, blurRec, skPaint,
                                                            kGrayTextVASize)));
             this->regenerateTextBlob(cacheBlob, skPaint, grPaint.getColor(), viewMatrix, blob, x, y,
@@ skipping 1049 matching lines @@
 
     GrColor color = grPaint.getColor();
     uint8_t paintAlpha = skPaint.getAlpha();
     for (int run = 0; run < cacheBlob->fRunCount; run++) {
         this->flushRun(target, &pipelineBuilder, cacheBlob, run, color, paintAlpha, 0, 0);
     }
 
     // Now flush big glyphs
     this->flushBigGlyphs(cacheBlob, rt, grPaint, clip, 0, 0);
 }