Linux: add a tool and code to make use_system_ffmpeg option more compatible

media/media.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # Override to dynamically link the PulseAudio library.
     'use_pulseaudio%': 0,
     # Override to dynamically link the cras (ChromeOS audio) library.
@@ skipping 451 matching lines @@
           'dependencies': [
             '<(DEPTH)/third_party/libvpx/libvpx.gyp:libvpx',
           ],
         }, {  # use_libvpx == 0
           # Exclude the sources that depend on libvpx.
           'sources!': [
             'filters/vpx_video_decoder.cc',
             'filters/vpx_video_decoder.h',
           ],
         }],
+        ['use_system_ffmpeg == 1', {
+          'defines': [
+            '<!(python <(DEPTH)/tools/compile_test/compile_test.py '
+                '--code "#include <libavcodec/avcodec.h>\n'
+                'int test() { return CODEC_ID_OPUS; }" '
+                '--on-failure CHROMIUM_OMIT_CODEC_ID_OPUS)',
+            '<!(python <(DEPTH)/tools/compile_test/compile_test.py '
+                '--code "#include <libavcodec/avcodec.h>\n'
+                'int test() { return AV_CODEC_ID_VP9; }" '
+                '--on-failure CHROMIUM_OMIT_AV_CODEC_ID_VP9)',
+          ],
+        }],
         ['OS == "ios"', {
           'includes': [
             # For shared_memory_support_sources variable.
             'shared_memory_support.gypi',
           ],
           'sources': [
             'base/media_stub.cc',
             # These sources are normally built via a dependency on the
             # shared_memory_support target, but that target is not built on iOS.
             # Instead, directly build only the files that are needed for iOS.
@@ skipping 1000 matching lines @@
           ],
           'sources': [
             'video/capture/screen/differ_block_sse2.cc',
             'video/capture/screen/differ_block_sse2.h',
           ],
         }, # end of target differ_block_sse2
       ],
     }],
   ],
 }