Refactor how we store and use samplers in Ganesh

src/effects/SkMagnifierImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkMagnifierImageFilter.h"
 #include "SkColorPriv.h"
@@ skipping 137 matching lines @@
     fragBuilder->codeAppend("\t\t\tfloat dist = length(delta);\n");
     fragBuilder->codeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n");
     fragBuilder->codeAppend("\t\t\tweight = min(dist * dist, 1.0);\n");
     fragBuilder->codeAppend("\t\t} else {\n");
     fragBuilder->codeAppend("\t\t\tvec2 delta_squared = delta * delta;\n");
     fragBuilder->codeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n");
     fragBuilder->codeAppend("\t\t}\n");
 
     fragBuilder->codeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n");
     fragBuilder->codeAppend("\t\tvec4 output_color = ");
-    fragBuilder->appendTextureLookup(args.fTexSamplers[0], "mix_coord");
+    fragBuilder->appendTextureLookup(uniformHandler->getSampler(args.fTexSamplers[0]), "mix_coord");
     fragBuilder->codeAppend(";\n");
 
     fragBuilder->codeAppendf("\t\t%s = output_color;", args.fOutputColor);
     SkString modulate;
     GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor);
     fragBuilder->codeAppend(modulate.c_str());
 }
 
 void GrGLMagnifierEffect::onSetData(const GrGLSLProgramDataManager& pdman,
                                     const GrProcessor& effect) {
@@ skipping 198 matching lines @@
 
 #ifndef SK_IGNORE_TO_STRING
 void SkMagnifierImageFilter::toString(SkString* str) const {
     str->appendf("SkMagnifierImageFilter: (");
     str->appendf("src: (%f,%f,%f,%f) ",
                  fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom);
     str->appendf("inset: %f", fInset);
     str->append(")");
 }
 #endif