Load CMA backend from shared library

chromecast/media/media.gyp

Index: chromecast/media/media.gyp
diff --git a/chromecast/media/media.gyp b/chromecast/media/media.gyp
index 86879e5b24ad9658e7c27f0f9d127a0a52760e7b..0adf9ac66264640b855d583e30cb677791226ff2 100644
--- a/chromecast/media/media.gyp
+++ b/chromecast/media/media.gyp
@@ -89,6 +89,8 @@
         '../..',
       ],
       'sources': [
+        'cma/base/backend_client_callbacks.cc',
+        'cma/base/backend_client_callbacks.h',
         'cma/base/balanced_media_task_runner_factory.cc',
         'cma/base/balanced_media_task_runner_factory.h',
         'cma/base/buffering_controller.cc',
@@ -104,10 +106,12 @@
         'cma/base/coded_frame_provider.h',
         'cma/base/decoder_buffer_adapter.cc',
         'cma/base/decoder_buffer_adapter.h',
-        'cma/base/decoder_buffer_base.cc',
-        'cma/base/decoder_buffer_base.h',
+        'cma/base/decoder_buffer_impl.cc',
+        'cma/base/decoder_buffer_impl.h',
         'cma/base/decoder_config_adapter.cc',
         'cma/base/decoder_config_adapter.h',
+        'cma/base/decrypt_config_impl.cc',
+        'cma/base/decrypt_config_impl.h',
         'cma/base/media_task_runner.cc',
         'cma/base/media_task_runner.h',
         'cma/base/simple_media_task_runner.cc',
@@ -115,52 +119,26 @@
       ],
     },
     {
-      'target_name': 'cma_backend',
+      'target_name': 'default_cma_backend',
       'type': '<(component)',
       'dependencies': [
-        'cma_base',
-        'media_base',
+        '../chromecast.gyp:cast_base',
         '../../base/base.gyp:base',
-        '../../media/media.gyp:media',
       ],
       'include_dirs': [
         '../..',
       ],
       'sources': [
-        'cma/backend/audio_pipeline_device.cc',
-        'cma/backend/audio_pipeline_device.h',
         'cma/backend/audio_pipeline_device_default.cc',
         'cma/backend/audio_pipeline_device_default.h',
-        'cma/backend/media_clock_device.cc',
-        'cma/backend/media_clock_device.h',
         'cma/backend/media_clock_device_default.cc',
         'cma/backend/media_clock_device_default.h',
-        'cma/backend/media_component_device.cc',
-        'cma/backend/media_component_device.h',
         'cma/backend/media_component_device_default.cc',
         'cma/backend/media_component_device_default.h',
-        'cma/backend/media_pipeline_device.cc',
-        'cma/backend/media_pipeline_device.h',
-        'cma/backend/media_pipeline_device_factory.h',
-        'cma/backend/media_pipeline_device_factory_default.cc',
-        'cma/backend/media_pipeline_device_factory_default.h',
-        'cma/backend/media_pipeline_device_params.cc',
-        'cma/backend/media_pipeline_device_params.h',
-        'cma/backend/video_pipeline_device.cc',
+        'cma/backend/media_pipeline_backend_default.cc',
+        'cma/backend/media_pipeline_backend_default.h',
         'cma/backend/video_pipeline_device_default.cc',
         'cma/backend/video_pipeline_device_default.h',
-        'cma/backend/video_pipeline_device.h',
-      ],
-      'conditions': [
-        ['chromecast_branding=="Chrome"', {
-          'dependencies': [
-            '../internal/chromecast_internal.gyp:cma_backend_internal',
-          ],
-        }, {
-          'sources': [
-            'cma/backend/media_pipeline_device_factory_simple.cc'
-          ],
-        }],
       ],
     },
     {
@@ -205,7 +183,6 @@
       'target_name': 'cma_pipeline',
       'type': '<(component)',
       'dependencies': [
-        'cma_backend',
         'cma_base',
         'media_base',
         'media_cdm',
@@ -260,12 +237,12 @@
       'target_name': 'cast_media',
       'type': 'none',
       'dependencies': [
-        'cma_backend',
         'cma_base',
         'cma_filters',
         'cma_ipc',
         'cma_ipc_streamer',
         'cma_pipeline',
+        'default_cma_backend',
         'media_cdm',
       ],
     },
@@ -321,7 +298,8 @@
           'target_name': 'libcast_media_1.0',
           'type': 'shared_library',
           'dependencies': [
-            '../../chromecast/chromecast.gyp:cast_public_api'
+            '../../chromecast/chromecast.gyp:cast_public_api',
+            'default_cma_backend'
           ],
           'include_dirs': [
             '../..',