DevTools: Tethering in Android Webview

BUG=416154

Review URL: https://codereview.chromium.org/703333005

Cr-Commit-Position: refs/heads/master@{#304014}

android_webview/native/aw_dev_tools_server.cc

@@ -19,6 +19,7 @@
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/user_agent.h"
 #include "jni/AwDevToolsServer_jni.h"
+#include "net/base/net_errors.h"
 #include "net/socket/unix_domain_server_socket_posix.h"
 
 using content::DevToolsAgentHost;
@@ -30,12 +31,17 @@ namespace {
 const char kFrontEndURL[] =
     "http://chrome-devtools-frontend.appspot.com/serve_rev/%s/devtools.html";
 const char kSocketNameFormat[] = "webview_devtools_remote_%d";
+const char kTetheringSocketName[] = "webview_devtools_tethering_%d_%d";
+
+const int kBackLog = 10;
 
 // Delegate implementation for the devtools http handler for WebView. A new
 // instance of this gets created each time web debugging is enabled.
 class AwDevToolsServerDelegate : public content::DevToolsHttpHandlerDelegate {
  public:
-  AwDevToolsServerDelegate() {}
+  AwDevToolsServerDelegate() : last_tethering_socket_(0) {
+  }
+
   virtual ~AwDevToolsServerDelegate() {}
 
   // DevToolsHttpProtocolHandler::Delegate overrides.
@@ -51,10 +57,20 @@ class AwDevToolsServerDelegate : public content::DevToolsHttpHandlerDelegate {
 
   scoped_ptr<net::ServerSocket>
   CreateSocketForTethering(std::string* name) override {
-    return scoped_ptr<net::ServerSocket>();
+    *name = base::StringPrintf(
+        kTetheringSocketName, getpid(), ++last_tethering_socket_);
+    scoped_ptr<net::UnixDomainServerSocket> socket(
+        new net::UnixDomainServerSocket(
+            base::Bind(&content::CanUserConnectToDevTools), true));
+    if (socket->ListenWithAddressAndPort(*name, 0, kBackLog) != net::OK)
+      return scoped_ptr<net::ServerSocket>();
+
+    return socket.Pass();
   }
 
  private:
+  int last_tethering_socket_;
+
   DISALLOW_COPY_AND_ASSIGN(AwDevToolsServerDelegate);
 };