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/samplecode/SampleCCPRGeometry.cpp b/samplecode/SampleCCPRGeometry.cpp
index 59c6581..c5cc09d 100644
--- a/samplecode/SampleCCPRGeometry.cpp
+++ b/samplecode/SampleCCPRGeometry.cpp
@@ -148,7 +148,9 @@
         }
     };
 
-    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { return new Impl; }
+    std::unique_ptr<GrGLSLFragmentProcessor> onMakeProgramImpl() const override {
+        return std::make_unique<Impl>();
+    }
 };
 
 void CCPRGeometryView::onDrawContent(SkCanvas* canvas) {