media/capture: Adding WebmMuxer class and unittests

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index d73d584de4700fbfb1e160a93f02edf68b3afcdd..db021364d46896e0b2afe54366dacd960e35b9e4 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -477,6 +477,8 @@
         'capture/video/win/video_capture_device_mf_win.h',
         'capture/video/win/video_capture_device_win.cc',
         'capture/video/win/video_capture_device_win.h',
+        'capture/webm_muxer.cc',
+        'capture/webm_muxer.h',
         'cdm/aes_decryptor.cc',
         'cdm/aes_decryptor.h',
         'cdm/default_cdm_factory.cc',
@@ -687,6 +689,17 @@
             'filters/vpx_video_decoder.h',
           ],
         }],
+        ['media_use_libwebm==1', {
+          'dependencies': [
+            '<(DEPTH)/third_party/libwebm/libwebm.gyp:libwebm',
+          ],
+        }, {  # media_use_libwebm==0
+          # Exclude the sources that depend on libwebm.
+          'sources!': [
+            'capture/webm_muxer.cc',
+            'capture/webm_muxer.h',
+          ],
+        }],
         ['enable_browser_cdms==1', {
           'sources': [
             'base/browser_cdm.cc',
@@ -1247,6 +1260,7 @@
         'filters/video_renderer_algorithm_unittest.cc',
         'filters/vp8_bool_decoder_unittest.cc',
         'filters/vp8_parser_unittest.cc',
+        'capture/webm_muxer_unittest.cc',
         'formats/common/offset_byte_queue_unittest.cc',
         'formats/webm/cluster_builder.cc',
         'formats/webm/cluster_builder.h',
@@ -1306,6 +1320,17 @@
             'test/pipeline_integration_test_base.cc',
           ],
         }],
+        ['media_use_libwebm==1', {
+          'dependencies': [
+            '<(DEPTH)/third_party/libwebm/libwebm.gyp:libwebm',
+          ],
+        }, {  # media_use_libwebm==0
+          # Exclude the sources that depend on libwebm.
+          'sources!': [
+            'capture/webm_muxer_unittest.cc',
+          ],
+        }],
+
         ['(os_posix==1 and OS!="mac") or (OS=="win" and component!="shared_library" and win_use_allocator_shim==1)', {
           'conditions': [
             ['use_allocator!="none"', {