Make GrGLSLFragmentProcessors be created as std::unique_ptr.

Rename factory function from createGLSLInstance() to makeProgramImpl()

Bug: b/180759848
Bug: skia:11358
Change-Id: I095bdf1f26db5a8192fa8ab59000db4a1d561d96
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/373738
Reviewed-by: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/gradients/generated/GrLinearGradientLayout.cpp b/src/gpu/gradients/generated/GrLinearGradientLayout.cpp
index 8d83ebb..cc31c05 100644
--- a/src/gpu/gradients/generated/GrLinearGradientLayout.cpp
+++ b/src/gpu/gradients/generated/GrLinearGradientLayout.cpp
@@ -35,8 +35,8 @@
     void onSetData(const GrGLSLProgramDataManager& pdman,
                    const GrFragmentProcessor& _proc) override {}
 };
-GrGLSLFragmentProcessor* GrLinearGradientLayout::onCreateGLSLInstance() const {
-    return new GrGLSLLinearGradientLayout();
+std::unique_ptr<GrGLSLFragmentProcessor> GrLinearGradientLayout::onMakeProgramImpl() const {
+    return std::make_unique<GrGLSLLinearGradientLayout>();
 }
 void GrLinearGradientLayout::onGetGLSLProcessorKey(const GrShaderCaps& caps,
                                                    GrProcessorKeyBuilder* b) const {}