Split trace messages into chunks based on size, not event count

content/browser/devtools/devtools_tracing_handler.cc

Index: content/browser/devtools/devtools_tracing_handler.cc
diff --git a/content/browser/devtools/devtools_tracing_handler.cc b/content/browser/devtools/devtools_tracing_handler.cc
index 981c2047836269c9959959c32a324101ed73f4a1..0a3a7e71c244aa4fd073525e1cb2c7e8ce8ddedd 100644
--- a/content/browser/devtools/devtools_tracing_handler.cc
+++ b/content/browser/devtools/devtools_tracing_handler.cc
@@ -92,7 +92,8 @@ void DevToolsTracingHandler::ReadRecordingResult(
       if (buffer.size())
         buffer.append(",");
       buffer.append(item);
-      if (i % 1000 == 0) {
+      const size_t kMessageSizeThreshold = 1024 * 1024;
+      if (buffer.size() > kMessageSizeThreshold) {
         OnTraceDataCollected(buffer);
         buffer.clear();
       }