Rename EmitArgs::fSamplers to fTexSamplers

Renames fSamplers to fTexSamplers in GrProcessor EmitArgs, and renames
GrGLSLTextureSampler to GrGLSLSampler. This will allow us to add a
second array of buffer samplers.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1862373003

Review URL: https://codereview.chromium.org/1862373003
diff --git a/src/gpu/glsl/GrGLSLProgramBuilder.h b/src/gpu/glsl/GrGLSLProgramBuilder.h
index 952db7e..4d253c7 100644
--- a/src/gpu/glsl/GrGLSLProgramBuilder.h
+++ b/src/gpu/glsl/GrGLSLProgramBuilder.h
@@ -15,7 +15,7 @@
 #include "glsl/GrGLSLPrimitiveProcessor.h"
 #include "glsl/GrGLSLProgramDataManager.h"
 #include "glsl/GrGLSLUniformHandler.h"
-#include "glsl/GrGLSLTextureSampler.h"
+#include "glsl/GrGLSLSampler.h"
 #include "glsl/GrGLSLVertexShaderBuilder.h"
 #include "glsl/GrGLSLXferProcessor.h"
 
@@ -146,8 +146,7 @@
                                 const GrGLSLExpr4& coverageIn,
                                 bool ignoresCoverage,
                                 GrPixelLocalStorageState plsState);
-    void emitSamplers(const GrProcessor& processor,
-                      GrGLSLTextureSampler::TextureSamplerArray* outSamplers);
+    void emitSamplers(const GrProcessor& processor, GrGLSLSampler::SamplerArray* outTexSamplers);
     void emitFSOutputSwizzle(bool hasSecondaryOutput);
     bool checkSamplerCounts();