Enable HEVC building for Chrome OS protected media and fuzzing

HEVC accelerated decoding will be used for Chrome OS protected media and
we also want it built for fuzzer targets.

BUG=b:153111783
TEST=H265Decoder built for volteer

Change-Id: I2cdc484d7750eeb98a38a8e64093d98312bf48ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517646Reviewed-by: Max Moroz <mmoroz@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Cr-Commit-Position: refs/heads/master@{#824523}

media/media_options.gni

@@ -80,8 +80,11 @@ declare_args() {
       proprietary_codecs && (is_chromecast || is_fuchsia || use_fuzzing_engine)
 
   # Enable HEVC/H265 demuxing. Actual decoding must be provided by the
-  # platform. Enabled by default for Chromecast.
-  enable_platform_hevc = proprietary_codecs && is_chromecast
+  # platform. Enabled by default for Chromecast, Chrome OS protected media and
+  # fuzzer builds.
+  enable_platform_hevc =
+      proprietary_codecs &&
+      (is_chromecast || use_chromeos_protected_media || use_fuzzing_engine)
 
   # Enable Dolby Vision demuxing. Enable by default for Chromecast. Actual
   # decoding must be provided by the platform. Note some Dolby Vision profiles