Refactor how we store and use samplers in Ganesh

src/gpu/gl/GrGLProgramDataManager.h

Index: src/gpu/gl/GrGLProgramDataManager.h
diff --git a/src/gpu/gl/GrGLProgramDataManager.h b/src/gpu/gl/GrGLProgramDataManager.h
index c2cb8fc69894f8ff8d8d8934a791242fd9121832..b3b5715da10dd5cdf467decc4298419ecb7e5475 100644
--- a/src/gpu/gl/GrGLProgramDataManager.h
+++ b/src/gpu/gl/GrGLProgramDataManager.h
@@ -46,11 +46,12 @@ public:
     GrGLProgramDataManager(GrGLGpu*, GrGLuint programID, const UniformInfoArray&,
                            const VaryingInfoArray&);
 
-    /** Functions for uploading uniform values. The varities ending in v can be used to upload to an
-     *  array of uniforms. arrayCount must be <= the array count of the uniform.
-     */
-    void setSampler(UniformHandle, int texUnit) const;
 
+    void setSamplers(const SkTArray<GrGLSampler>& samplers) const;
+
+    /** Functions for uploading uniform values. The varities ending in v can be used to upload to an
+    *  array of uniforms. arrayCount must be <= the array count of the uniform.
+    */
     void set1f(UniformHandle, float v0) const override;
     void set1fv(UniformHandle, int arrayCount, const float v[]) const override;
     void set2f(UniformHandle, float, float) const override;