Add standard way to indicate GM is GPU-only.

gm/rrects.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #if SK_SUPPORT_GPU
 #include "GrTest.h"
@@ skipping 39 matching lines @@
             case kEffect_Type:
                 name.append("_effect");
                 break;
         }
         return name;
     }
 
     SkISize onISize() SK_OVERRIDE { return SkISize::Make(kImageWidth, kImageHeight); }
 
     void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        GrContext* context = NULL;
 #if SK_SUPPORT_GPU
         GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
-        GrContext* context = rt ? rt->getContext() : NULL;
+        context = rt ? rt->getContext() : NULL;
+#endif
         if (kEffect_Type == fType && NULL == context) {
+            this->drawGpuOnlyMessage(canvas);
             return;
         }
-#endif
 
         SkPaint paint;
         if (kAA_Draw_Type == fType) {
             paint.setAntiAlias(true);
         }
 
         static const SkRect kMaxTileBound = SkRect::MakeWH(SkIntToScalar(kTileX),
                                                            SkIntToScalar(kTileY));
 #ifdef SK_DEBUG
         static const SkRect kMaxImageBound = SkRect::MakeWH(SkIntToScalar(kImageWidth),
@@ skipping 176 matching lines @@
 
 DEF_GM( return new RRectGM(RRectGM::kAA_Draw_Type); )
 DEF_GM( return new RRectGM(RRectGM::kBW_Draw_Type); )
 DEF_GM( return new RRectGM(RRectGM::kAA_Clip_Type); )
 DEF_GM( return new RRectGM(RRectGM::kBW_Clip_Type); )
 #if SK_SUPPORT_GPU
 DEF_GM( return new RRectGM(RRectGM::kEffect_Type); )
 #endif
 
 }