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

content/browser/devtools/devtools_http_handler_impl.cc

 // Copyright (c) 2012 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 "content/browser/devtools/devtools_http_handler_impl.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 145 matching lines @@
  public:
   BrowserTarget(base::MessageLoop* message_loop,
                 net::HttpServer* server,
                 int connection_id)
       : message_loop_(message_loop),
         server_(server),
         connection_id_(connection_id),
         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_);
   }
 
   // Takes ownership.
   void RegisterHandler(DevToolsProtocol::Handler* handler) {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     handler->SetNotifier(
         base::Bind(&BrowserTarget::Respond, base::Unretained(this)));
     handlers_.push_back(handler);
   }
@@ skipping 511 matching lines @@
 
 void DevToolsHttpHandlerImpl::OnWebSocketRequestUI(
     int connection_id,
     const net::HttpServerRequestInfo& request) {
   if (!thread_)
     return;
 
   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(
         new TetheringHandler(delegate_.get(), thread_->message_loop_proxy()));
     browser_target->RegisterHandler(
         new DevToolsSystemInfoHandler());
     browser_targets_[connection_id] = browser_target;
     AcceptWebSocket(connection_id, request);
     return;
   }
@@ skipping 267 matching lines @@
         id.c_str(),
         host);
     dictionary->SetString(
         kTargetDevtoolsFrontendUrlField, devtools_frontend_url);
   }
 
   return dictionary;
 }
 
 }  // namespace content