Add Traffic Annotation to interfaces of AdbClientSocket.

Network Traffic Annotation is added to the socket write of the
AdbClientSocket class.

Bug: 656607
Change-Id: I1e05fc201290e0c55b78b8b03aee79284ffd7b4d
Reviewed-on: https://chromium-review.googlesource.com/813757
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523715}

chrome/browser/devtools/device/adb/adb_client_socket.cc

@@ -19,6 +19,7 @@
 #include "net/base/net_errors.h"
 #include "net/log/net_log_source.h"
 #include "net/socket/tcp_client_socket.h"
+#include "net/traffic_annotation/network_traffic_annotation.h"
 
 namespace {
 
@@ -196,12 +197,34 @@ void AdbClientSocket::SendCommand(const std::string& command,
                                   const CommandCallback& callback) {
   scoped_refptr<net::StringIOBuffer> request_buffer =
       new net::StringIOBuffer(EncodeMessage(command));
-  int result = socket_->Write(request_buffer.get(),
-                              request_buffer->size(),
-                              base::Bind(&AdbClientSocket::ReadResponse,
-                                         base::Unretained(this),
-                                         callback,
-                                         is_void));
+  net::NetworkTrafficAnnotationTag traffic_annotation =
+      net::DefineNetworkTrafficAnnotation("adb_client_socket", R"(
+        semantics {
+          sender: "ADB Client Socket"
+          description:
+            "Remote debugging is supported over existing ADB (Android Debug "
+            "Bridge) connection, in addition to raw USB connection. This "
+            "socket talks to the local ADB daemon which routes debugging "
+            "traffic to a remote device."
+          trigger:
+            "A user connects to an Android device using remote debugging."
+          data: "Any data required for remote debugging."
+          destination: LOCAL
+        }
+        policy {
+          cookies_allowed: false
+          setting:
+            "To use adb with a device connected over USB, you must enable USB "
+            "debugging in the device system settings, under Developer options."
+          policy_exception_justification:
+            "This is not a network request and is only used for remote "
+            "debugging."
+        })");
+  int result =
+      socket_->Write(request_buffer.get(), request_buffer->size(),
+                     base::Bind(&AdbClientSocket::ReadResponse,
+                                base::Unretained(this), callback, is_void),
+                     traffic_annotation);
   if (result != net::ERR_IO_PENDING)
     ReadResponse(callback, is_void, result);
 }