chrome: Support CefSettings logging config (see #3685)

Also enables logging by default for Release builds (previously
required the `--enable-logging` flag). Logging can still be
disabled by passing the `--disable-logging` flag.

patch/patches/chrome_common_logging.patch

@@ -0,0 +1,35 @@
+diff --git chrome/common/features.gni chrome/common/features.gni
+index 01367ff6efd6c..975ea8e446dce 100644
+--- chrome/common/features.gni
++++ chrome/common/features.gni
+@@ -7,6 +7,7 @@ import("//build/config/chromeos/ui_mode.gni")
+ import("//build/config/compiler/compiler.gni")
+ import("//build/config/dcheck_always_on.gni")
+ import("//build/config/features.gni")
++import("//cef/libcef/features/features.gni")
+ import("//components/compose/features.gni")
+ import("//components/feed/features.gni")
+ import("//components/nacl/features.gni")
+@@ -31,7 +32,7 @@ assert(use_blink, "Chromium without blink shouldn't use anything in //chrome")
+ declare_args() {
+   # Enables the build to have logging enabled by default.
+   # This is intended for use only in developer builds.
+-  chrome_enable_logging_by_default = is_debug
++  chrome_enable_logging_by_default = is_debug || enable_cef
+ 
+   # Platforms where Chrome x509 server certificate enterprise policies are
+   # supported. This must must match the supported_on/future_on list of the
+@@ -90,11 +91,13 @@ declare_args() {
+   # optimize_webui was moved to ui/base/ui_features.gni
+ }
+ 
++if (!enable_cef) {
+ # Logging must be disabled by default in all official builds (including special
+ # DCHECK-enabled builds). Logging is enabled by default for debug builds, and
+ # may be selectively enabled by default for release builds.
+ assert(!chrome_enable_logging_by_default || !is_official_build,
+        "Logging must be disabled by default in Official builds")
++}
+ 
+ # Use brlapi from brltty for braille display support.
+ use_brlapi = is_chromeos_ash