Implemented HEVC video demuxing and parsing

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 0aae2ff62422a926e96dc3d4ebb3064a7de81a90..d6461d5e74f504cea6a6b9149a5b1f7a2e475f31 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -7,6 +7,7 @@ import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/module_args/v8.gni")
+import("//media/media_options.gni")
 import("//testing/test.gni")
 import("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
 
@@ -310,6 +311,10 @@ if (!is_mac) {
 
     defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
 
+    if (proprietary_codecs && enable_hevc_demuxing) {
+      defines += [ "ENABLE_HEVC_DEMUXING" ]
+    }
+
     configs += [
       "//build/config:precompiled_headers",
       "//build/config/compiler:no_size_t_to_int_warning",