Revert of Revert of Add logs to debug a flakiness on GPU Mac bots.

content/browser/devtools/devtools_http_handler_impl.cc

Index: content/browser/devtools/devtools_http_handler_impl.cc
diff --git a/content/browser/devtools/devtools_http_handler_impl.cc b/content/browser/devtools/devtools_http_handler_impl.cc
index e7b7fb9b99e68f17eff500742b76addccf88e3e3..85038e1d76adf6654aba8258b4f7d04954c11919 100644
--- a/content/browser/devtools/devtools_http_handler_impl.cc
+++ b/content/browser/devtools/devtools_http_handler_impl.cc
@@ -163,12 +163,14 @@
         tracing_handler_(new devtools::tracing::TracingHandler(
             devtools::tracing::TracingHandler::Browser)),
         protocol_handler_(new DevToolsProtocolHandlerImpl()) {
+    VLOG(2) << "BrowserTarget::BrowserTarget()";
     protocol_handler_->SetNotifier(
         base::Bind(&BrowserTarget::Respond, base::Unretained(this)));
     protocol_handler_->SetTracingHandler(tracing_handler_.get());
   }
 
   ~BrowserTarget() {
+    VLOG(2) << "BrowserTarget::~BrowserTarget()";
     STLDeleteElements(&handlers_);
   }
 
@@ -700,6 +702,7 @@
   std::string browser_prefix = "/devtools/browser";
   size_t browser_pos = request.path.find(browser_prefix);
   if (browser_pos == 0) {
+    VLOG(2) << "OnWebSocketRequestUI: new BrowserTarget";
     BrowserTarget* browser_target = new BrowserTarget(
         thread_->message_loop(), server_.get(), connection_id);
     browser_target->RegisterHandler(