Refactor how we store and use samplers in Ganesh

src/gpu/glsl/GrGLSLFragmentProcessor.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLSLFragmentProcessor.h"
 #include "GrFragmentProcessor.h"
 #include "GrProcessor.h"
@@ skipping 65 matching lines @@
      */
     int firstCoordAt = args.fFp.numTransformsExclChildren();
     int firstTextureAt = args.fFp.numTexturesExclChildren();
     int firstBufferAt = args.fFp.numBuffersExclChildren();
     for (int i = 0; i < childIndex; ++i) {
         firstCoordAt += args.fFp.childProcessor(i).numTransforms();
         firstTextureAt += args.fFp.childProcessor(i).numTextures();
         firstBufferAt += args.fFp.childProcessor(i).numBuffers();
     }
     GrGLSLTransformedCoordsArray childCoords;
-    SamplerArray childTexSamplers;
-    SamplerArray childBufferSamplers;
+    const SamplerHandle* childTexSamplers = nullptr;
+    const SamplerHandle* childBufferSamplers =  nullptr;
     if (childProc.numTransforms() > 0) {
         childCoords.push_back_n(childProc.numTransforms(), &args.fCoords[firstCoordAt]);
     }
     if (childProc.numTextures() > 0) {
-        childTexSamplers.push_back_n(childProc.numTextures(), &args.fTexSamplers[firstTextureAt]);
+        childTexSamplers = &args.fTexSamplers[firstTextureAt];
     }
     if (childProc.numBuffers() > 0) {
-        childBufferSamplers.push_back_n(childProc.numBuffers(),
-                                        &args.fBufferSamplers[firstBufferAt]);
+        childBufferSamplers = &args.fBufferSamplers[firstBufferAt];
     }
 
     // emit the code for the child in its own scope
     fragBuilder->codeAppend("{\n");
     fragBuilder->codeAppendf("// Child Index %d (mangle: %s): %s\n", childIndex,
                              fragBuilder->getMangleString().c_str(), childProc.name());
     EmitArgs childArgs(fragBuilder,
                        args.fUniformHandler,
                        args.fGLSLCaps,
                        childProc,
                        outputColor,
                        inputColor,
                        childCoords,
                        childTexSamplers,
                        childBufferSamplers);
     this->childProcessor(childIndex)->emitCode(childArgs);
     fragBuilder->codeAppend("}\n");
 
     fragBuilder->onAfterChildProcEmitCode();
 }