Enable ClangTidy check modernize-make-unique.

The majority of existing call sites were automatically updated using
clang-tidy -fix. A small handful required a manual update,
e.g. CppCodeGen.

This check is a bit lenient, and in particular will not flag cases like
`std::unique_ptr<Base>(new Derived())` which is still pretty common
throughout our codebase. This CL does not attempt to replace all the
cases that ClangTidy does not flag.

Change-Id: I5eba48ef880e25d22de80f321a68c389ba769e36
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/307459
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/src/sksl/SkSLCPPCodeGenerator.cpp b/src/sksl/SkSLCPPCodeGenerator.cpp
index a95b36c..efffa2d 100644
--- a/src/sksl/SkSLCPPCodeGenerator.cpp
+++ b/src/sksl/SkSLCPPCodeGenerator.cpp
@@ -1102,7 +1102,7 @@
         this->write("}\n");
         this->writef("std::unique_ptr<GrFragmentProcessor> %s::clone() const {\n",
                      fFullName.c_str());
-        this->writef("    return std::unique_ptr<GrFragmentProcessor>(new %s(*this));\n",
+        this->writef("    return std::make_unique<%s>(*this);\n",
                      fFullName.c_str());
         this->write("}\n");
     }