Make OS audio buffer size limits visible.

media/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/buildflag_header.gni")
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
@@ skipping 742 matching lines @@
     "base/audio_point.h",
     "base/audio_sample_types.h",
     "base/channel_layout.cc",
     "base/channel_layout.h",
     "base/limits.h",
     "base/media_export.h",
     "base/vector_math.cc",
     "base/vector_math.h",
     "base/vector_math_testing.h",
   ]
+  if (is_mac) {

[DaleCurtis, 2017/06/27 17:25:07]

We have a base/mac/BUILD.gn this should go in.

[Andrew MacPherson, 2017/06/27 17:46:49]

I had tried this first but it didn't seem to work as AudioLatency depends on
audio_util_mac.cc and audio_latency.cc is built into the "shared_memory_support"
component in this media/BUILD.gn file, so linking failed without including it
here. Does that make sense?

[DaleCurtis, 2017/06/27 17:54:24]

Ah I didn't notice this was in shmem support. This seems fine in that case.
Leave a comment here about why this is the case. Since we've announced the NaCl
deprecation we can hopefully clean this up in a few years.

Lets rename the file to audio_latency_mac.cc for clarity though; util classes
are too vague.

+    sources += [
+      "base/mac/audio_util_mac.cc",
+      "base/mac/audio_util_mac.h",
+    ]
+  }
   configs += [
     ":media_config",
     ":media_implementation",
   ]
   deps = [
     "//base",
     "//ui/gfx/geometry",
   ]
 }
 
@@ skipping 92 matching lines @@
   fuzzer_test("media_mp4_avcc_parser_fuzzer") {
     sources = [
       "formats/mp4/mp4_avcc_parser_fuzzer.cc",
     ]
     deps = [
       ":media",
       "//base",
     ]
   }
 }