Add logs to debug a flakiness on GPU Mac bots.

This is temporary and will be removed after we pin down the issue.

BUG=424024
TEST=
R=kbr@chromium.org
TBR=dgozman@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/684423005

Cr-Commit-Position: refs/heads/master@{#302371}

content/browser/devtools/devtools_http_handler_impl.cc

@@ -163,12 +163,14 @@ class DevToolsHttpHandlerImpl::BrowserTarget {
         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 @@ void DevToolsHttpHandlerImpl::OnWebSocketRequestUI(
   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(

content/browser/devtools/devtools_system_info_handler.cc

@@ -101,6 +101,8 @@ DevToolsSystemInfoHandler::~DevToolsSystemInfoHandler() {
 scoped_refptr<DevToolsProtocol::Response>
 DevToolsSystemInfoHandler::OnGetInfo(
     scoped_refptr<DevToolsProtocol::Command> command) {
+  VLOG(2) << "DevToolsSystemInfoHandler::OnGetInfo() : BEGIN";
+
   gpu::GPUInfo gpu_info = GpuDataManagerImpl::GetInstance()->GetGPUInfo();
   base::DictionaryValue* gpu_dict = new base::DictionaryValue;
 
@@ -124,6 +126,8 @@ DevToolsSystemInfoHandler::OnGetInfo(
   system_dict->SetString(kModelName, gpu_info.machine_model_name);
   system_dict->SetString(kModelVersion, gpu_info.machine_model_version);
   system_dict->Set(kGPU, gpu_dict);
+
+  VLOG(2) << "DevToolsSystemInfoHandler::OnGetInfo() : END";
   return command->SuccessResponse(system_dict);
 }
 

content/browser/gpu/gpu_data_manager_impl_private.cc

@@ -301,6 +301,7 @@ unsigned int GpuDataManagerImplPrivate::GetDisplayCount() const {
 }
 
 gpu::GPUInfo GpuDataManagerImplPrivate::GetGPUInfo() const {
+  VLOG(2) << "GpuDataManagerImplPrivate::GetGPUInfo()";
   return gpu_info_;
 }
 
@@ -904,6 +905,7 @@ GpuDataManagerImplPrivate::GpuDataManagerImplPrivate(
       display_count_(0),
       gpu_process_accessible_(true),
       finalized_(false) {
+  VLOG(2) << "GpuDataManagerImplPrivate::GpuDataManagerImplPrivate()";
   DCHECK(owner_);
   const base::CommandLine* command_line =
       base::CommandLine::ForCurrentProcess();
@@ -922,6 +924,7 @@ GpuDataManagerImplPrivate::GpuDataManagerImplPrivate(
 }
 
 GpuDataManagerImplPrivate::~GpuDataManagerImplPrivate() {
+  VLOG(2) << "GpuDataManagerImplPrivate::~GpuDataManagerImplPrivate()";
 #if defined(OS_MACOSX)
   CGDisplayRemoveReconfigurationCallback(DisplayReconfigCallback, owner_);
 #endif
@@ -931,6 +934,8 @@ void GpuDataManagerImplPrivate::InitializeImpl(
     const std::string& gpu_blacklist_json,
     const std::string& gpu_driver_bug_list_json,
     const gpu::GPUInfo& gpu_info) {
+  VLOG(2) << "GpuDataManagerImplPrivate::InitializeImpl()";
+
   const bool log_gpu_control_list_decisions =
       base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kLogGpuControlListDecisions);