Pass camera facing info to audio client

media/base/BUILD.gn

Index: media/base/BUILD.gn
diff --git a/media/base/BUILD.gn b/media/base/BUILD.gn
index 8a6793803e02678140fa6e40aeae34c0bf3c8301..b799c39a76d5fd09e84c46138496ab9abcb91fe7 100644
--- a/media/base/BUILD.gn
+++ b/media/base/BUILD.gn
@@ -280,6 +280,7 @@ target(link_target_type, "base") {
     "//gpu",
     "//media:media_features",
     "//media:shared_memory_support",
+    "//media/base:video_facing",
     "//ppapi/features",
     "//skia",
     "//third_party/libyuv",
@@ -355,6 +356,17 @@ target(link_target_type, "base") {
   }
 }
 
+target(link_target_type, "video_facing") {
+  visibility = [
+    "//chromeos",
+    "//content/browser",
+    "//media/base",
+  ]
+  sources = [
+    "video_facing.h",
+  ]
+}
+
 static_library("test_support") {
   testonly = true
   sources = [