Add a QuicMemSlice constructor that takes a heap allocated buffer. Advantage:
(1) For small message (e.g., 64 byte ones in time service client), there is no need to use an allocator.
(2) Might make some unit tests easier to write.

PiperOrigin-RevId: 343097958
Change-Id: I5ae41200ef5ba48c89049927e896e423914dfb64

quic/platform/api/quic_mem_slice.h

diff --git a/quic/platform/api/quic_mem_slice.h b/quic/platform/api/quic_mem_slice.h
index 2d44085..362f5dc 100644
--- a/quic/platform/api/quic_mem_slice.h
+++ b/quic/platform/api/quic_mem_slice.h
@@ -5,6 +5,7 @@
 #ifndef QUICHE_QUIC_PLATFORM_API_QUIC_MEM_SLICE_H_
 #define QUICHE_QUIC_PLATFORM_API_QUIC_MEM_SLICE_H_
 
+#include <memory>
 #include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
 #include "net/quic/platform/impl/quic_mem_slice_impl.h"
 
@@ -33,6 +34,11 @@
   QuicMemSlice(QuicUniqueBufferPtr buffer, size_t length)
       : impl_(std::move(buffer), length) {}
 
+  // Constructs a QuicMemSlice that takes ownership of |buffer| allocated on
+  // heap.  |length| must not be zero.
+  QuicMemSlice(std::unique_ptr<char[]> buffer, size_t length)
+      : impl_(std::move(buffer), length) {}
+
   // Constructs QuicMemSlice from |impl|. It takes the reference away from
   // |impl|.
   explicit QuicMemSlice(QuicMemSliceImpl impl) : impl_(std::move(impl)) {}

quic/platform/api/quic_mem_slice_test.cc

diff --git a/quic/platform/api/quic_mem_slice_test.cc b/quic/platform/api/quic_mem_slice_test.cc
index d441afa..3855010 100644
--- a/quic/platform/api/quic_mem_slice_test.cc
+++ b/quic/platform/api/quic_mem_slice_test.cc
@@ -4,6 +4,7 @@
 
 #include "net/third_party/quiche/src/quic/platform/api/quic_mem_slice.h"
 
+#include <memory>
 #include "net/third_party/quiche/src/quic/core/quic_simple_buffer_allocator.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_test.h"
 
@@ -45,6 +46,16 @@
   EXPECT_TRUE(slice_.empty());
 }
 
+TEST_F(QuicMemSliceTest, SliceAllocatedOnHeap) {
+  auto buffer = std::make_unique<char[]>(128);
+  char* orig_data = buffer.get();
+  size_t used_length = 105;
+  QuicMemSlice slice = QuicMemSlice(std::move(buffer), used_length);
+  QuicMemSlice moved = std::move(slice);
+  EXPECT_EQ(moved.data(), orig_data);
+  EXPECT_EQ(moved.length(), used_length);
+}
+
 }  // namespace
 }  // namespace test
 }  // namespace quic