[headless] Configure renderer preferences from system settings

This is similar to what chrome/browser/renderer_preferences_util does.

Bug: none
Change-Id: I1b0b73dca22175446c143497a07c1ad2994e72e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637081
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845043}

headless/lib/browser/headless_web_contents_impl.cc

@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "base/bind.h"
+#include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/stl_util.h"
@@ -17,6 +18,7 @@
 #include "base/threading/sequenced_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 #include "base/values.h"
+#include "build/build_config.h"
 #include "components/security_state/content/content_utils.h"
 #include "components/security_state/core/security_state.h"
 #include "content/public/browser/browser_thread.h"
@@ -29,6 +31,7 @@
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
+#include "content/public/browser/renderer_preferences_util.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/common/bindings_policy.h"
@@ -42,6 +45,8 @@
 #include "printing/buildflags/buildflags.h"
 #include "third_party/blink/public/common/renderer_preferences/renderer_preferences.h"
 #include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/base/ui_base_features.h"
 #include "ui/compositor/compositor.h"
 #include "ui/gfx/switches.h"
 
@@ -51,6 +56,28 @@
 
 namespace headless {
 
+namespace {
+
+void UpdatePrefsFromSystemSettings(blink::RendererPreferences* prefs) {
+#if defined(OS_LINUX) || defined(OS_WIN)
+  content::UpdateFontRendererPreferencesFromSystemSettings(prefs);
+#endif
+
+  // The values were copied from chrome/browser/renderer_preferences_util.cc.
+#if defined(USE_AURA)
+  prefs->focus_ring_color = SkColorSetRGB(0x4D, 0x90, 0xFE);
+#endif
+  if (::features::IsFormControlsRefreshEnabled()) {
+#if defined(OS_MAC)
+    prefs->focus_ring_color = SkColorSetRGB(0x00, 0x5F, 0xCC);
+#else
+    prefs->focus_ring_color = SkColorSetRGB(0x10, 0x10, 0x10);
+#endif
+  }
+}
+
+}  // namespace
+
 // static
 HeadlessWebContentsImpl* HeadlessWebContentsImpl::From(
     HeadlessWebContents* web_contents) {
@@ -302,6 +329,7 @@ HeadlessWebContentsImpl::HeadlessWebContentsImpl(
   HeadlessPrintManager::CreateForWebContents(web_contents_.get());
 // TODO(weili): Add support for printing OOPIFs.
 #endif
+  UpdatePrefsFromSystemSettings(web_contents_->GetMutableRendererPrefs());
   web_contents_->GetMutableRendererPrefs()->accept_languages =
       browser_context->options()->accept_language();
   web_contents_->GetMutableRendererPrefs()->hinting =