Reland of tracing v2: Introduce TraceBufferWriter (https://codereview.chromium.org/2196663002)

components/tracing/core/proto_utils_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/tracing/core/proto_utils.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 96 matching lines @@
                      0x100000000000000);
   EXPECT_VARINT64_EQ("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F", 9,
                      0x7FFFFFFFFFFFFFFF);
   EXPECT_VARINT64_EQ("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x01", 10,
                      0x8000000000000000);
   EXPECT_VARINT64_EQ("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x01", 10,
                      0xFFFFFFFFFFFFFFFF);
 
   uint8_t buf[kMessageLengthFieldSize];
 
-  WriteRedundantLength(0, buf);
+  WriteRedundantVarInt(0, buf);
   EXPECT_EQ(0, memcmp("\x80\x80\x80\x00", buf, sizeof(buf)));
 
-  WriteRedundantLength(1, buf);
+  WriteRedundantVarInt(1, buf);
   EXPECT_EQ(0, memcmp("\x81\x80\x80\x00", buf, sizeof(buf)));
 
-  WriteRedundantLength(0x80, buf);
+  WriteRedundantVarInt(0x80, buf);
   EXPECT_EQ(0, memcmp("\x80\x81\x80\x00", buf, sizeof(buf)));
 
-  WriteRedundantLength(0x332211, buf);
+  WriteRedundantVarInt(0x332211, buf);
   EXPECT_EQ(0, memcmp("\x91\xC4\xCC\x01", buf, sizeof(buf)));
 
   // Largest allowed length.
-  WriteRedundantLength(0x0FFFFFFF, buf);
+  WriteRedundantVarInt(0x0FFFFFFF, buf);
   EXPECT_EQ(0, memcmp("\xFF\xFF\xFF\x7F", buf, sizeof(buf)));
 }
 
 }  // namespace
 }  // namespace proto
 }  // namespace v2
 }  // namespace tracing