Add standard way to indicate GM is GPU-only.

gm/texdata.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This test only works with the GPU backend.
 
@@ skipping 110 matching lines @@
                     for (int x = 0; x < S; ++x) {
                         gTextureData[offset + y * stride + x] =
                             ((x + y) % 2) ? (i ? green : red) : blue;
                     }
                 }
                 texture->writePixels(S, (i ? 0 : S), S, S,
                                      texture->config(), gTextureData.get(),
                                      4 * stride);
                 ctx->drawRect(paint, vm, SkRect::MakeWH(2*S, 2*S));
             }
+        } else {
+            this->drawGpuOnlyMessage(canvas);
         }
     }
 
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new TexDataGM; }
 static GMRegistry reg(MyFactory);
 
 }
 
 #endif