Refactor how we store and use samplers in Ganesh

src/gpu/effects/GrTextureDomain.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTextureDomainEffect_DEFINED
 #define GrTextureDomainEffect_DEFINED
 
@@ skipping 102 matching lines @@
          *                  It is assumed that this is a variable and not an expression.
          * @param inModulateColor   if non-nullptr the sampled color will be modulated with this
          *                          expression before being written to outColor.
          */
         void sampleTexture(GrGLSLShaderBuilder* builder,
                            GrGLSLUniformHandler* uniformHandler,
                            const GrGLSLCaps* glslCaps,
                            const GrTextureDomain& textureDomain,
                            const char* outColor,
                            const SkString& inCoords,
-                           const GrGLSLSampler& sampler,
+                           GrGLSLFragmentProcessor::SamplerHandle sampler,
                            const char* inModulateColor = nullptr);
 
         /**
          * Call this from GrGLSLFragmentProcessor::setData() to upload uniforms necessary for the
          * texture domain. The rectangle is automatically adjusted to account for the texture's
          * origin.
          */
         void setData(const GrGLSLProgramDataManager& pdman, const GrTextureDomain& textureDomain,
                      GrSurfaceOrigin textureOrigin);
 
@@ skipping 72 matching lines @@
     bool onIsEqual(const GrFragmentProcessor&) const override;
 
     void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     typedef GrSingleTextureEffect INHERITED;
 };
 
 #endif