Refactor how we store and use samplers in Ganesh

src/gpu/glsl/GrGLSLXferProcessor.h

Index: src/gpu/glsl/GrGLSLXferProcessor.h
diff --git a/src/gpu/glsl/GrGLSLXferProcessor.h b/src/gpu/glsl/GrGLSLXferProcessor.h
index adc3d417658b46c85f7c054acc5248a86d88d31c..f4a8ebdfa029b0d6d5fbc11cf09463dbe8c2c019 100644
--- a/src/gpu/glsl/GrGLSLXferProcessor.h
+++ b/src/gpu/glsl/GrGLSLXferProcessor.h
@@ -22,7 +22,8 @@ public:
     GrGLSLXferProcessor() {}
     virtual ~GrGLSLXferProcessor() {}
 
-    typedef GrGLSLSampler::SamplerArray SamplerArray;
+    typedef GrGLSLProgramDataManager::UniformHandle SamplerHandle;
+
     struct EmitArgs {
         EmitArgs(GrGLSLXPFragmentBuilder* fragBuilder,
                  GrGLSLUniformHandler* uniformHandler,
@@ -32,8 +33,8 @@ public:
                  const char* inputCoverage,
                  const char* outputPrimary,
                  const char* outputSecondary,
-                 const SamplerArray& texSamplers,
-                 const SamplerArray& bufferSamplers,
+                 const SamplerHandle* texSamplers,
+                 const SamplerHandle* bufferSamplers,
                  const bool usePLSDstRead)
             : fXPFragBuilder(fragBuilder)
             , fUniformHandler(uniformHandler)
@@ -55,8 +56,8 @@ public:
         const char* fInputCoverage;
         const char* fOutputPrimary;
         const char* fOutputSecondary;
-        const SamplerArray& fTexSamplers;
-        const SamplerArray& fBufferSamplers;
+        const SamplerHandle* fTexSamplers;
+        const SamplerHandle* fBufferSamplers;
         bool fUsePLSDstRead;
     };
     /**