From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jeremy Apthorp <nornagon@nornagon.net>
Date: Wed, 28 Aug 2019 12:21:25 -0700
Subject: expose SetUserAgent on NetworkContext

Applying
https://chromium-review.googlesource.com/c/chromium/src/+/1585083 before
it's merged. There may end up being a better way of doing this, or the
patch may be merged upstream, at which point this patch should be
removed.

diff --git a/net/url_request/static_http_user_agent_settings.h b/net/url_request/static_http_user_agent_settings.h
index 0ccfe130f00ec3b6c75cd8ee04d5a2777e1fd00c..653829457d58bf92057cc36aa8a289703d8b0577 100644
--- a/net/url_request/static_http_user_agent_settings.h
+++ b/net/url_request/static_http_user_agent_settings.h
@@ -26,13 +26,17 @@ class NET_EXPORT StaticHttpUserAgentSettings : public HttpUserAgentSettings {
     accept_language_ = new_accept_language;
   }
 
+  void set_user_agent(const std::string& new_user_agent) {
+    user_agent_ = new_user_agent;
+  }
+
   // HttpUserAgentSettings implementation
   std::string GetAcceptLanguage() const override;
   std::string GetUserAgent() const override;
 
  private:
   std::string accept_language_;
-  const std::string user_agent_;
+  std::string user_agent_;
 
   DISALLOW_COPY_AND_ASSIGN(StaticHttpUserAgentSettings);
 };
diff --git a/services/network/network_context.cc b/services/network/network_context.cc
index 9d340a9207d2e0b71e0726a0904282e160e036ae..f827654c8480ee9618ea48b418a5469882f4c1d3 100644
--- a/services/network/network_context.cc
+++ b/services/network/network_context.cc
@@ -1006,6 +1006,13 @@ void NetworkContext::SetNetworkConditions(
                                       std::move(network_conditions));
 }
 
+void NetworkContext::SetUserAgent(const std::string& new_user_agent) {
+  // This may only be called on NetworkContexts created with a constructor that
+  // calls ApplyContextParamsToBuilder.
+  DCHECK(user_agent_settings_);
+  user_agent_settings_->set_user_agent(new_user_agent);
+}
+
 void NetworkContext::SetAcceptLanguage(const std::string& new_accept_language) {
   // This may only be called on NetworkContexts created with the constructor
   // that calls MakeURLRequestContext().
diff --git a/services/network/network_context.h b/services/network/network_context.h
index abc82d01185e1d3320bfd82bcd1705423e325ff2..b6885b6ebaf78d384a3f124ec6ef07b711ccbe10 100644
--- a/services/network/network_context.h
+++ b/services/network/network_context.h
@@ -235,6 +235,7 @@ class COMPONENT_EXPORT(NETWORK_SERVICE) NetworkContext
   void CloseIdleConnections(CloseIdleConnectionsCallback callback) override;
   void SetNetworkConditions(const base::UnguessableToken& throttling_profile_id,
                             mojom::NetworkConditionsPtr conditions) override;
+  void SetUserAgent(const std::string& new_user_agent) override;
   void SetAcceptLanguage(const std::string& new_accept_language) override;
   void SetEnableReferrers(bool enable_referrers) override;
 #if defined(OS_CHROMEOS)
diff --git a/services/network/public/mojom/network_context.mojom b/services/network/public/mojom/network_context.mojom
index 1d9ffd3de180e3256fb63a497544feeb427ae7ff..c37432121142472010b767b7fb257e20bc60b3fc 100644
--- a/services/network/public/mojom/network_context.mojom
+++ b/services/network/public/mojom/network_context.mojom
@@ -1016,6 +1016,9 @@ interface NetworkContext {
   SetNetworkConditions(mojo_base.mojom.UnguessableToken throttling_profile_id,
                        NetworkConditions? conditions);
 
+  // Updates the user agent to be used for requests.
+  SetUserAgent(string new_user_agent);
+
   // Updates the Accept-Language header to be used for requests.
   SetAcceptLanguage(string new_accept_language);
 
diff --git a/services/network/test/test_network_context.h b/services/network/test/test_network_context.h
index 4d832a7980805ac48938579ea587b474bbeb35d7..402d546fd26a91409bf4df3574b76ac8cbc32152 100644
--- a/services/network/test/test_network_context.h
+++ b/services/network/test/test_network_context.h
@@ -99,6 +99,7 @@ class TestNetworkContext : public mojom::NetworkContext {
   void CloseIdleConnections(CloseIdleConnectionsCallback callback) override {}
   void SetNetworkConditions(const base::UnguessableToken& throttling_profile_id,
                             mojom::NetworkConditionsPtr conditions) override {}
+  void SetUserAgent(const std::string& new_user_agent) override {}
   void SetAcceptLanguage(const std::string& new_accept_language) override {}
   void SetEnableReferrers(bool enable_referrers) override {}
 #if defined(OS_CHROMEOS)