Load CMA backend from shared library

chromecast/chromecast.gyp

Index: chromecast/chromecast.gyp
diff --git a/chromecast/chromecast.gyp b/chromecast/chromecast.gyp
index 778decdf64bca7c5a120e4a3fc7845555170e910..5d2961b74863617f5d8458eb923ae7a9100696c1 100644
--- a/chromecast/chromecast.gyp
+++ b/chromecast/chromecast.gyp
@@ -23,6 +23,7 @@
   'target_defaults': {
     'include_dirs': [
       '..',  # Root of Chromium checkout
+      'public/', # Public APIs
     ],
     'conditions': [
       ['disable_display==1', {
@@ -43,11 +44,22 @@
         'public/chromecast_export.h',
         'public/graphics_properties_shlib.h',
         'public/graphics_types.h',
+        'public/media_codec_support.h',
+        'public/media/audio_pipeline_device.h',
+        'public/media/cast_decoder_buffer.h',
+        'public/media/cast_decrypt_config.h',
+        'public/media/cast_key_system.h',
         'public/media/decoder_config.h',
+        'public/media/media_clock_device.h',
+        'public/media/media_component_device.h',
+        'public/media/media_pipeline_backend.h',
+        'public/media/media_pipeline_device_params.h',
         'public/media/stream_id.h',
+        'public/media/video_pipeline_device.h',
         'public/osd_plane.h',
         'public/osd_plane_shlib.h',
         'public/osd_surface.h',
+        'public/task_runner.h',
         'public/video_plane.h',
       ],
     },
@@ -76,7 +88,9 @@
         'base/process_utils.cc',
         'base/process_utils.h',
         'base/serializers.cc',
-        'base/serializers.h'
+        'base/serializers.h',
+        'base/task_runner_impl.cc',
+        'base/task_runner_impl.h',
       ],
       'conditions': [
         ['OS=="android"', {