Add StackTrace::ToString().

base/debug/stack_trace_unittest.cc

 // Copyright (c) 2010 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 <sstream>
 #include <string>
 
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 10 matching lines @@
 #define MAYBE_OutputToStream OutputToStream
 #endif
 TEST(StackTrace, MAYBE_OutputToStream) {
   StackTrace trace;
 
   // Dump the trace into a string.
   std::ostringstream os;
   trace.OutputToStream(&os);
   std::string backtrace_message = os.str();
 
+  // ToString() should produce the same output.
+  EXPECT_EQ(backtrace_message, trace.ToString());
+
 #if defined(OS_POSIX) && !defined(OS_MACOSX) && NDEBUG
   // Stack traces require an extra data table that bloats our binaries,
   // so they're turned off for release builds.  We stop the test here,
   // at least letting us verify that the calls don't crash.
   return;
 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && NDEBUG
 
   size_t frames_found = 0;
   trace.Addresses(&frames_found);
   ASSERT_GE(frames_found, 5u) <<
@@ skipping 67 matching lines @@
   VLOG(1) << os.str();
 }
 
 // The test is used for manual testing, e.g., to see the raw output.
 TEST(StackTrace, DebugPrintBacktrace) {
   StackTrace().PrintBacktrace();
 }
 
 }  // namespace debug
 }  // namespace base