Adding more detail to MessageQueue::Dispatch logging.

webrtc/base/location.cc

+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/base/location.h"
+
+#include <sstream>
+
+namespace rtc {
+
+Location::Location(const char* function_name,
+                   const char* file_name,
+                   int line_number)
+    : function_name_(function_name),
+      file_name_(file_name),
+      line_number_(line_number) {}
+
+Location::Location()
+    : function_name_("Unknown"), file_name_("Unknown"), line_number_(-1) {}
+
+Location::Location(const Location& other)
+    : function_name_(other.function_name_),
+      file_name_(other.file_name_),
+      line_number_(other.line_number_) {}
+
+Location& Location::operator=(const Location& other) {
+  function_name_ = other.function_name_;
+  file_name_ = other.file_name_;
+  line_number_ = other.line_number_;
+  return *this;
+}
+
+std::string Location::ToString() const {
+  std::ostringstream os;
+  os << function_name_ << '@' << file_name_ << ':' << line_number_;

[tommi, 2016/05/31 19:56:27]

It would be great to not need sstream.  I'm looking into whether we can build
without it, which could save hundreds of KB.

[Taylor Brandstetter, 2016/06/02 22:38:41]

What's the approved method of building a string without it?

[tommi, 2016/06/03 05:45:10]

sprintfn. There's also a stringbuilder class somewhere iirc. 

+  return os.str();
+}
+
+}  // namespace rtc