Add VAVDA, the VAAPI Video Decode Accelerator for Intel CPUs.

content/content_common.gypi

Index: content/content_common.gypi
diff --git a/content/content_common.gypi b/content/content_common.gypi
index 5d2e2f7a0d8a660e6b9d79385e165bede6e80923..a56945b40c2ed7a34a764e4bbd39ab4e73cf7e71 100644
--- a/content/content_common.gypi
+++ b/content/content_common.gypi
@@ -387,6 +387,19 @@
         ],
       },
     }],
+    ['chromeos == 1', {
+      'sources': [
+        'common/gpu/media/h264_dpb.cc',
+        'common/gpu/media/h264_dpb.h',
+        'common/gpu/media/vaapi_h264_decoder.cc',
+        'common/gpu/media/vaapi_h264_decoder.h',
+        'common/gpu/media/vaapi_video_decode_accelerator.cc',
+        'common/gpu/media/vaapi_video_decode_accelerator.h',
+      ],
+      'include_dirs': [
+        '<(DEPTH)/third_party/libva',
+      ],
+    }],
     ['OS=="win"', {
       'dependencies': [
         '../media/media.gyp:media',