SkMakeUnique.h defines skstd::make_unique<T>(Args...)

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2293963002

Review-Url: https://codereview.chromium.org/2293963002

src/core/SkMakeUnique.h

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkMakeUnique_DEFINED
+#define SkMakeUnique_DEFINED
+
+#include <memory>
+
+namespace skstd {
+
+// std::make_unique is in C++14
+template<typename T, typename... Args>
+std::unique_ptr<T> make_unique(Args&&... args) {
+    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+
+}
+
+#endif  // SkMakeUnique_DEFINED

src/pdf/SkDeflate.cpp

@@ -8,6 +8,7 @@
 
 #include "SkData.h"
 #include "SkDeflate.h"
+#include "SkMakeUnique.h"
 
 #include "zlib.h"
 
@@ -62,7 +63,7 @@ struct SkDeflateWStream::Impl {
 SkDeflateWStream::SkDeflateWStream(SkWStream* out,
                                    int compressionLevel,
                                    bool gzip)
-    : fImpl(new SkDeflateWStream::Impl) {
+    : fImpl(skstd::make_unique<SkDeflateWStream::Impl>()) {
     fImpl->fOut = out;
     fImpl->fInBufferIndex = 0;
     if (!fImpl->fOut) {

src/pdf/SkPDFDevice.cpp

@@ -13,6 +13,7 @@
 #include "SkColorFilter.h"
 #include "SkDraw.h"
 #include "SkGlyphCache.h"
+#include "SkMakeUnique.h"
 #include "SkPath.h"
 #include "SkPathEffect.h"
 #include "SkPathOps.h"
@@ -1344,11 +1345,11 @@ std::unique_ptr<SkStreamAsset> SkPDFDevice::content() const {
         entry.fContent.writeToStream(&buffer);
     }
     gsState.drainStack();
-
-    return std::unique_ptr<SkStreamAsset>(
-            buffer.bytesWritten() > 0
-            ? buffer.detachAsStream()
-            : new SkMemoryStream);
+    if (buffer.bytesWritten() > 0) {
+        return std::unique_ptr<SkStreamAsset>(buffer.detachAsStream());
+    } else {
+        return skstd::make_unique<SkMemoryStream>();
+    }
 }
 
 /* Draws an inverse filled path by using Path Ops to compute the positive

src/pdf/SkPDFDocument.cpp

@@ -5,6 +5,7 @@
  * found in the LICENSE file.
  */
 
+#include "SkMakeUnique.h"
 #include "SkPDFCanon.h"
 #include "SkPDFCanvas.h"
 #include "SkPDFDevice.h"
@@ -167,7 +168,6 @@ static sk_sp<SkPDFDict> generate_page_tree(SkTArray<sk_sp<SkPDFDict>>* pages) {
     return std::move(curNodes[0]);
 }
 
-template <typename T> static T* clone(const T* o) { return o ? new T(*o) : nullptr; }
 ////////////////////////////////////////////////////////////////////////////////
 
 SkPDFDocument::SkPDFDocument(SkWStream* stream,
@@ -466,7 +466,7 @@ sk_sp<SkDocument> SkPDFMakeDocument(SkWStream* stream,
 
 sk_sp<SkDocument> SkDocument::MakePDF(const char path[], SkScalar dpi) {
     auto delete_wstream = [](SkWStream* stream, bool) { delete stream; };
-    std::unique_ptr<SkFILEWStream> stream(new SkFILEWStream(path));
+    auto stream = skstd::make_unique<SkFILEWStream>(path);
     return stream->isValid()
                    ? SkPDFMakeDocument(stream.release(), delete_wstream, dpi,
                                        SkDocument::PDFMetadata(), nullptr,

src/pdf/SkPDFTypes.cpp

@@ -7,6 +7,7 @@
 
 #include "SkData.h"
 #include "SkDeflate.h"
+#include "SkMakeUnique.h"
 #include "SkPDFTypes.h"
 #include "SkPDFUtils.h"
 #include "SkStream.h"
@@ -506,8 +507,7 @@ void SkPDFSharedStream::addResources(
 ////////////////////////////////////////////////////////////////////////////////
 
 SkPDFStream:: SkPDFStream(sk_sp<SkData> data) {
-    this->setData(std::unique_ptr<SkStreamAsset>(
-                          new SkMemoryStream(std::move(data))));
+    this->setData(skstd::make_unique<SkMemoryStream>(std::move(data)));
 }
 
 SkPDFStream::SkPDFStream(std::unique_ptr<SkStreamAsset> stream) {

tests/PDFPrimitivesTest.cpp

@@ -12,6 +12,7 @@
 #include "SkDocument.h"
 #include "SkDeflate.h"
 #include "SkImageEncoder.h"
+#include "SkMakeUnique.h"
 #include "SkMatrix.h"
 #include "SkPDFCanon.h"
 #include "SkPDFDevice.h"
@@ -75,8 +76,8 @@ static void assert_emit_eq(skiatest::Reporter* reporter,
 
 static void TestPDFStream(skiatest::Reporter* reporter) {
     char streamBytes[] = "Test\nFoo\tBar";
-    std::unique_ptr<SkStreamAsset> streamData(new SkMemoryStream(
-        streamBytes, strlen(streamBytes), true));
+    auto streamData = skstd::make_unique<SkMemoryStream>(
+            streamBytes, strlen(streamBytes), true);
     auto stream = sk_make_sp<SkPDFStream>(std::move(streamData));
     assert_emit_eq(reporter,
                    *stream,