AW: create networkcontext for net service

This creates a mostly default NetworkContext. This duplicates the work
provided by the content-layer implementation, but will later be extended
to provide more functionality.

The main addition beyond content layer is this configures WebView's
HTTP cache.

R=changwan@chromium.org, mmenke@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.android:android_mojo
Bug: 887538
Test: No major issues with NetworkService feature enabled.
Change-Id: I9cc1823f144d9ffc96fca917b0763b74e36a53d7
Reviewed-on: https://chromium-review.googlesource.com/c/1314133
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605508}

android_webview/DEPS

@@ -27,6 +27,7 @@ include_rules = [
   "+media/media_buildflags.h",
   "+mojo/public/cpp/bindings",
   "+net",
+  "+services/network/network_service.h",
   "+services/network/public/cpp",
   "+services/preferences/tracked",
   "+services/service_manager/public",

android_webview/browser/aw_browser_context.cc

@@ -140,6 +140,9 @@ base::FilePath AwBrowserContext::GetCacheDir() {
 void AwBrowserContext::PreMainMessageLoopRun(net::NetLog* net_log) {
   FilePath cache_path = GetCacheDir();
 
+  // TODO(ntfschr): set this to nullptr when the NetworkService is disabled,
+  // once we remove a dependency on url_request_context_getter_
+  // (http://crbug.com/887538).
   url_request_context_getter_ = new AwURLRequestContextGetter(
       cache_path, context_storage_path_.Append(kChannelIDFilename),
       CreateProxyConfigService(), user_pref_service_.get(), net_log);

android_webview/browser/aw_content_browser_client.cc

@@ -26,6 +26,7 @@
 #include "android_webview/browser/net/aw_url_request_context_getter.h"
 #include "android_webview/browser/renderer_host/aw_resource_dispatcher_host_delegate.h"
 #include "android_webview/browser/tracing/aw_tracing_delegate.h"
+#include "android_webview/common/aw_content_client.h"
 #include "android_webview/common/aw_descriptors.h"
 #include "android_webview/common/aw_switches.h"
 #include "android_webview/common/crash_reporter/aw_crash_reporter_client.h"
@@ -64,6 +65,7 @@
 #include "content/public/browser/client_certificate_delegate.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/navigation_throttle.h"
+#include "content/public/browser/network_service_instance.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
@@ -78,6 +80,7 @@
 #include "net/log/net_log.h"
 #include "net/ssl/ssl_cert_request_info.h"
 #include "net/ssl/ssl_info.h"
+#include "services/network/network_service.h"
 #include "services/network/public/cpp/features.h"
 #include "services/network/public/cpp/resource_request.h"
 #include "services/service_manager/public/cpp/binder_registry.h"
@@ -230,6 +233,34 @@ AwContentBrowserClient::AwContentBrowserClient(
 
 AwContentBrowserClient::~AwContentBrowserClient() {}
 
+network::mojom::NetworkContextPtr AwContentBrowserClient::CreateNetworkContext(
+    content::BrowserContext* context,
+    bool in_memory,
+    const base::FilePath& relative_partition_path) {
+  DCHECK(context);
+  if (!base::FeatureList::IsEnabled(network::features::kNetworkService))
+    return nullptr;
+
+  network::mojom::NetworkContextPtr network_context;
+  network::mojom::NetworkContextParamsPtr context_params =
+      network::mojom::NetworkContextParams::New();
+  context_params->user_agent = GetUserAgent();
+  // TODO(ntfschr): set this value to a proper value based on the user's
+  // preferred locales (http://crbug.com/898555). For now, set this to
+  // "en-US,en" instead of "en-us,en", since Android guarantees region codes
+  // will be uppercase.
+  context_params->accept_language = "en-US,en";
+  context_params->enable_data_url_support = true;
+
+  context_params->http_cache_enabled = true;
+  context_params->http_cache_max_size = 20 * 1024 * 1024;  // 20M
+  context_params->http_cache_path = AwBrowserContext::GetCacheDir();
+
+  content::GetNetworkService()->CreateNetworkContext(
+      MakeRequest(&network_context), std::move(context_params));
+  return network_context;
+}
+
 AwBrowserContext* AwContentBrowserClient::InitBrowserContext() {
   base::FilePath user_data_dir;
   if (!base::PathService::Get(base::DIR_ANDROID_APP_DATA, &user_data_dir)) {

android_webview/browser/aw_content_browser_client.h

@@ -51,6 +51,11 @@ class AwContentBrowserClient : public content::ContentBrowserClient {
   // moment during startup. AwContentBrowserClient owns the result.
   AwBrowserContext* InitBrowserContext();
 
+  network::mojom::NetworkContextPtr CreateNetworkContext(
+      content::BrowserContext* context,
+      bool in_memory,
+      const base::FilePath& relative_partition_path) override;
+
   content::BrowserMainParts* CreateBrowserMainParts(
       const content::MainFunctionParams& parameters) override;
   content::WebContentsViewDelegate* GetWebContentsViewDelegate(