Avoid a string copy in URLRequestResourceBundleJob::GetData().

base/i18n/streaming_utf8_validator_perftest.cc

 // Copyright 2014 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.
 
 // All data that is passed through a WebSocket with type "Text" needs to be
 // validated as UTF8. Since this is done on the IO thread, it needs to be
 // reasonably fast.
 
 // We are only interested in the performance on valid UTF8. Invalid UTF8 will
 // result in a connection failure, so is unlikely to become a source of
@@ skipping 116 matching lines @@
     output = ConstructRepeatedTestString(output, length);
   }
   return output;
 }
 
 struct TestFunctionDescription {
   TestTargetType function;
   const char* function_name;
 };
 
+bool IsStringUTF8(const std::string& str) {
+  return base::IsStringUTF8(base::StringPiece(str));
+}
+
 // IsString7Bit is intentionally placed last so it can be excluded easily.
 const TestFunctionDescription kTestFunctions[] = {
     {&StreamingUtf8Validator::Validate, "StreamingUtf8Validator"},
     {&IsStringUTF8, "IsStringUTF8"}, {&IsString7Bit, "IsString7Bit"}};
 
 // Construct a test string from |construct_test_string| for each of the lengths
 // in |kTestLengths| in turn. For each string, run each test in |test_functions|
 // for a number of iterations such that the total number of bytes validated
 // is around 16MB.
 void RunSomeTests(
@@ skipping 78 matching lines @@
   RunSomeTests("%s: bytes=4 ranged length=%d repeat=%d",
                base::Bind(ConstructRangedTestString,
                           kFourByteSeqRangeStart,
                           kFourByteSeqRangeEnd),
                kTestFunctions,
                2);
 }
 
 }  // namespace
 }  // namespace base