Remove array of TextureSampler pointers from GrIOResourceProcessor.

Instead store sampler count on base class and subclasses implement a
virtual to get the ith sampler.

Change-Id: I13e2447a6467a09761d8615acb4aa360b87b1476
Reviewed-on: https://skia-review.googlesource.com/141563
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/effects/GrMagnifierEffect.cpp b/src/gpu/effects/GrMagnifierEffect.cpp
index 752a81b..aadd541 100644
--- a/src/gpu/effects/GrMagnifierEffect.cpp
+++ b/src/gpu/effects/GrMagnifierEffect.cpp
@@ -161,12 +161,15 @@
         , fXInvInset(src.fXInvInset)
         , fYInvInset(src.fYInvInset)
         , fSrcCoordTransform(src.fSrcCoordTransform) {
-    this->addTextureSampler(&fSrc);
+    this->setTextureSamplerCnt(1);
     this->addCoordTransform(&fSrcCoordTransform);
 }
 std::unique_ptr<GrFragmentProcessor> GrMagnifierEffect::clone() const {
     return std::unique_ptr<GrFragmentProcessor>(new GrMagnifierEffect(*this));
 }
+const GrFragmentProcessor::TextureSampler& GrMagnifierEffect::onTextureSampler(int index) const {
+    return IthTextureSampler(index, fSrc);
+}
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrMagnifierEffect);
 #if GR_TEST_UTILS
 std::unique_ptr<GrFragmentProcessor> GrMagnifierEffect::TestCreate(GrProcessorTestData* d) {