[Chromecast] Initialize QuicContext in URLRequestContextFactory

QuicContext needs to be provided for every URLRequestContext. Otherwise,
a crash occurs.

Bug: internal b/144527786
Test: CQ
Change-Id: Ideac2eeefe6b12450906a47b711ebd9afda90e31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1923032Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Sean Topping <seantopping@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716412}

chromecast/browser/url_request_context_factory.cc

@@ -38,6 +38,7 @@
 #include "net/http/http_server_properties.h"
 #include "net/http/http_stream_factory.h"
 #include "net/proxy_resolution/proxy_resolution_service.h"
+#include "net/quic/quic_context.h"
 #include "net/ssl/ssl_config_service_defaults.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_builder.h"
@@ -232,6 +233,8 @@ void URLRequestContextFactory::InitializeSystemContextDependencies() {
   system_host_resolver_ =
       net::HostResolver::CreateResolver(host_resolver_manager_.get());
 
+  quic_context_ = std::make_unique<net::QuicContext>();
+
   system_dependencies_initialized_ = true;
 }
 
@@ -344,6 +347,7 @@ net::URLRequestContext* URLRequestContextFactory::CreateMediaRequestContext() {
   DCHECK(main_getter_.get())
       << "Getting MediaRequestContext before MainRequestContext";
 
+  InitializeSystemContextDependencies();
   InitializeMediaContextDependencies();
 
   // Reuse main context dependencies except HostResolver and
@@ -403,6 +407,7 @@ void URLRequestContextFactory::ConfigureURLRequestContext(
   context->set_http_server_properties(http_server_properties_.get());
   context->set_http_user_agent_settings(http_user_agent_settings_.get());
   context->set_net_log(net_log_);
+  context->set_quic_context(quic_context_.get());
 
   // settings from the caller
   context->set_job_factory(job_factory.get());

chromecast/browser/url_request_context_factory.h

@@ -25,6 +25,7 @@ class HttpTransactionFactory;
 class HttpUserAgentSettings;
 class NetLog;
 class ProxyConfigService;
+class QuicContext;
 class URLRequestContextGetter;
 class URLRequestJobFactory;
 }  // namespace net
@@ -130,6 +131,7 @@ class URLRequestContextFactory {
   std::unique_ptr<net::CookieStore> system_cookie_store_;
   std::unique_ptr<net::URLRequestJobFactory> system_job_factory_;
   std::unique_ptr<net::HostResolver> system_host_resolver_;
+  std::unique_ptr<net::QuicContext> quic_context_;
 
   bool main_dependencies_initialized_;
   std::unique_ptr<net::HttpNetworkSession> main_network_session_;