Stop devtools if socket for http server cannot be instantiated.

Currently, it crashes entire chrome. This CL is to stop devtools gracefully
when socket for http server cannot be instantiated because of any reasons
including address-already-in-use error.

BUG=407999

Review URL: https://codereview.chromium.org/516483002

Cr-Commit-Position: refs/heads/master@{#292341}

content/browser/devtools/devtools_http_handler_impl.cc

@@ -252,9 +252,18 @@ void DevToolsHttpHandlerImpl::Stop() {
       base::Bind(&DevToolsHttpHandlerImpl::ResetHandlerThreadAndRelease, this));
 }
 
+void DevToolsHttpHandlerImpl::StopWithoutRelease() {
+  if (!thread_)
+    return;
+  BrowserThread::PostTaskAndReply(
+      BrowserThread::FILE, FROM_HERE,
+      base::Bind(&DevToolsHttpHandlerImpl::StopHandlerThread, this),
+      base::Bind(&DevToolsHttpHandlerImpl::ResetHandlerThread, this));
+}
+
 GURL DevToolsHttpHandlerImpl::GetFrontendURL() {
   net::IPEndPoint ip_address;
-  if (server_->GetLocalAddress(&ip_address))
+  if (server_ && server_->GetLocalAddress(&ip_address))
     return GURL();
   return GURL(std::string("http://") + ip_address.ToString() + frontend_url_);
 }
@@ -699,8 +708,17 @@ DevToolsHttpHandlerImpl::DevToolsHttpHandlerImpl(
 
 // Runs on the handler thread
 void DevToolsHttpHandlerImpl::Init() {
-  server_.reset(new net::HttpServer(server_socket_factory_->CreateAndListen(),
-                                    this));
+  scoped_ptr<net::ServerSocket> server_socket =
+      server_socket_factory_->CreateAndListen();
+  if (!server_socket) {
+    LOG(ERROR) << "Cannot start http server for devtools. Stop devtools.";
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(&DevToolsHttpHandlerImpl::StopWithoutRelease, this));
+    return;
+  }
+
+  server_.reset(new net::HttpServer(server_socket.Pass(), this));
   if (!active_port_output_directory_.empty())
     WriteActivePortToUserProfile();
 }

content/browser/devtools/devtools_http_handler_impl.h

@@ -89,6 +89,7 @@ class DevToolsHttpHandlerImpl
 
   void StartHandlerThread();
   void StopHandlerThread();
+  void StopWithoutRelease();
 
   void WriteActivePortToUserProfile();