DevTools: enable target domain handler on the browser target, make browser target non-discoverable.

content/browser/devtools/browser_devtools_agent_host.cc

Index: content/browser/devtools/browser_devtools_agent_host.cc
diff --git a/content/browser/devtools/browser_devtools_agent_host.cc b/content/browser/devtools/browser_devtools_agent_host.cc
index d4a50cefbdfec2867f5098851730367096c0ab4e..ebb58f8981992390929f5f340f54a0527487c002 100644
--- a/content/browser/devtools/browser_devtools_agent_host.cc
+++ b/content/browser/devtools/browser_devtools_agent_host.cc
@@ -11,6 +11,7 @@
 #include "content/browser/devtools/protocol/io_handler.h"
 #include "content/browser/devtools/protocol/memory_handler.h"
 #include "content/browser/devtools/protocol/system_info_handler.h"
+#include "content/browser/devtools/protocol/target_handler.h"
 #include "content/browser/devtools/protocol/tethering_handler.h"
 #include "content/browser/devtools/protocol/tracing_handler.h"
 #include "content/browser/frame_host/frame_tree_node.h"
@@ -30,6 +31,7 @@ BrowserDevToolsAgentHost::BrowserDevToolsAgentHost(
       io_handler_(new devtools::io::IOHandler(GetIOContext())),
       memory_handler_(new devtools::memory::MemoryHandler()),
       system_info_handler_(new devtools::system_info::SystemInfoHandler()),
+      target_handler_(new devtools::target::TargetHandler()),
       tethering_handler_(
           new devtools::tethering::TetheringHandler(socket_callback,
                                                     tethering_task_runner)),
@@ -42,6 +44,7 @@ BrowserDevToolsAgentHost::BrowserDevToolsAgentHost(
   dispatcher->SetIOHandler(io_handler_.get());
   dispatcher->SetMemoryHandler(memory_handler_.get());
   dispatcher->SetSystemInfoHandler(system_info_handler_.get());
+  dispatcher->SetTargetHandler(target_handler_.get());
   dispatcher->SetTetheringHandler(tethering_handler_.get());
   dispatcher->SetTracingHandler(tracing_handler_.get());
   NotifyCreated();