Add Cobalt console messages to trace.

This adds LogMessage trace events for the Cobalt log messsages, similar to
Chrome.

b/251825168

base/logging.cc

@@ -7,6 +7,7 @@
 #include <limits.h>
 
 #include "base/macros.h"
+#include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
 
 #if defined(STARBOARD)
@@ -485,6 +486,12 @@ SbLogPriority LogLevelToStarboardLogPriority(int level) {
 }
 #endif  // defined(STARBOARD)
 
+// Invokes macro to record trace event when a log message is emitted.
+void TraceLogMessage(const char* file, int line, const std::string& message) {
+  TRACE_EVENT_INSTANT1("log", "LogMessage", TRACE_EVENT_SCOPE_THREAD, "message",
+                       message);
+}
+
 }  // namespace
 
 #if DCHECK_IS_CONFIGURABLE
@@ -723,6 +730,7 @@ LogMessage::~LogMessage() {
 #endif
   stream_ << std::endl;
   std::string str_newline(stream_.str());
+  TraceLogMessage(file_, line_, str_newline);
 
   // Give any log message handler first dibs on the message.
   if (log_message_handler &&