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 40ed5ee64f8588a7373128adc0bc640d3b1d32f0..53cee001783f11a6364e66e4845c95eb27113285 100644
--- a/services/network/network_context.cc
+++ b/services/network/network_context.cc
@@ -1875,6 +1875,13 @@ 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 4395ddd300e876bf5fdb02d23cd401276c29e07d..ab9bb1d559e7761165b98f7c08e29a5b0d1a4aa6 100644
--- a/services/network/network_context.h
+++ b/services/network/network_context.h
@@ -321,6 +321,7 @@ class COMPONENT_EXPORT(NETWORK_SERVICE) NetworkContext
   void SetNetworkConditions(
       const base::UnguessableToken& throttling_profile_id,
       std::vector<mojom::MatchedNetworkConditionsPtr> 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 BUILDFLAG(IS_CT_SUPPORTED)
diff --git a/services/network/public/mojom/network_context.mojom b/services/network/public/mojom/network_context.mojom
index 160d18eba4101efab2dae444d09947f650079003..b78bde54c454a986ae8b2ed68bf0cf5a3d10568f 100644
--- a/services/network/public/mojom/network_context.mojom
+++ b/services/network/public/mojom/network_context.mojom
@@ -1268,6 +1268,9 @@ interface NetworkContext {
   SetNetworkConditions(mojo_base.mojom.UnguessableToken throttling_profile_id,
                        array<MatchedNetworkConditions> 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 195b237d37a8cf6739d83d87c79a67eb9f0a6bac..6381265ccba02b96b5d153585d576b7ed62b75af 100644
--- a/services/network/test/test_network_context.h
+++ b/services/network/test/test_network_context.h
@@ -156,6 +156,7 @@ class TestNetworkContext : public mojom::NetworkContext {
   void SetNetworkConditions(
       const base::UnguessableToken& throttling_profile_id,
       std::vector<mojom::MatchedNetworkConditionsPtr>) 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 BUILDFLAG(IS_CT_SUPPORTED)