Network traffic annotation added to url_provision_fetcher.

Network traffic annotation is added to network request of
url_provision_fetcher.

BUG=656607
------------------------------------------

Review-Url: https://codereview.chromium.org/2717483002
Cr-Commit-Position: refs/heads/master@{#462805}

content/browser/media/url_provision_fetcher.cc

@@ -8,6 +8,7 @@
 #include "content/public/browser/provision_fetcher_factory.h"
 #include "media/base/bind_to_current_loop.h"
 #include "net/base/load_flags.h"
+#include "net/traffic_annotation/network_traffic_annotation.h"
 #include "net/url_request/url_fetcher.h"
 
 using net::URLFetcher;
@@ -33,7 +34,37 @@ void URLProvisionFetcher::Retrieve(
   DVLOG(1) << __func__ << ": request:" << request_string;
 
   DCHECK(!request_);
-  request_ = URLFetcher::Create(GURL(request_string), URLFetcher::POST, this);
+  net::NetworkTrafficAnnotationTag traffic_annotation =
+      net::DefineNetworkTrafficAnnotation("url_prevision_fetcher", R"(
+        semantics {
+          sender: "Content Decryption Module"
+          description:
+            "For a Content Decryption Module (CDM) to obtain origin-specific "
+            "identifiers from an individualization or provisioning server. See "
+            "https://w3c.github.io/encrypted-media/#direct-individualization."
+          trigger:
+            "During protected content playback, if the CDM hasn’t been "
+            "provisioned yet, it may trigger a provision request which will be "
+            "sent to a provisioning server."
+          data:
+            "Opaque provision request generated by the CDM. It may contain "
+            "distinctive identifiers (see "
+            "https://w3c.github.io/encrypted-media/#distinctive-identifier) "
+            "and/or distinctive permanent identifiers (see "
+            "https://w3c.github.io/encrypted-media/#distinctive-permanent-"
+            "identifier), which must be encrypted. It does NOT contain origin "
+            "information, even in encrypted form."
+          destination: OTHER
+        }
+        policy {
+          cookies_allowed: false
+          setting:
+            "On Android, users can disable this feature by disabling Protected "
+            "Media Identifier permissions."
+          policy_exception_justification: "Not implemented."
+        })");
+  request_ = URLFetcher::Create(GURL(request_string), URLFetcher::POST, this,
+                                traffic_annotation);
 
   // SetUploadData is mandatory even if we are not uploading anything.
   request_->SetUploadData("", "");