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 0ab8187b0db8ae6db46d81738f653a2bc4c566f6..de3d55e85c22317f7f9375eb94d0d5d41b0dbd3b 100644
--- a/net/url_request/static_http_user_agent_settings.h
+++ b/net/url_request/static_http_user_agent_settings.h
@@ -30,13 +30,17 @@ 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_;
 };
 
 }  // namespace net
diff --git a/services/network/network_context.cc b/services/network/network_context.cc
index b1ac2fd235d3fc424d15b5c5991d7026a0f85090..6dc46954b070795de082d8542f8bae56d7b52dd4 100644
--- a/services/network/network_context.cc
+++ b/services/network/network_context.cc
@@ -1409,6 +1409,13 @@ 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 5b0a62302719f2aca565d933be4391ce59894f01..f16ba305b84c46ffbbef66d95c3f04bc8cc4f7e3 100644
--- a/services/network/network_context.h
+++ b/services/network/network_context.h
@@ -298,6 +298,7 @@ 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;
   void SetEnablePreconnect(bool enable_preconnect) override;
diff --git a/services/network/public/mojom/network_context.mojom b/services/network/public/mojom/network_context.mojom
index cc820d3cc7217263e23cd5aeea97dcf736e4be77..8dd936e47c8c528ee2ca777788da5df98342dc7c 100644
--- a/services/network/public/mojom/network_context.mojom
+++ b/services/network/public/mojom/network_context.mojom
@@ -1108,6 +1108,9 @@ 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 c19a06999a65d7510f4e43f9c72384f693358f2e..ea1a137892b928dbfdc9c7241acfaf23b2633e84 100644
--- a/services/network/test/test_network_context.h
+++ b/services/network/test/test_network_context.h
@@ -135,6 +135,7 @@ 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 {}
   void SetEnablePreconnect(bool enable_preconnect) override {}