Add VaapiVideoEncodeAccelerator for HW-accelerated video encode.

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index 2c0fbc25656d932e68d7bba1509a96e72849d472..305942b759e3a4f355f94fd80ae2128a826be1c8 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -657,6 +657,13 @@
             'formats/webm/chromeos/webm_encoder.h',
           ],
         }],
+        # For VaapiVideoEncodeAccelerator.
+        ['target_arch != "arm" and chromeos == 1 and use_x11 == 1', {
+          'sources': [
+            'filters/h264_bitstream_buffer.cc',
+            'filters/h264_bitstream_buffer.h',
+          ],
+        }],
         ['OS!="ios"', {
           'dependencies': [
             '../third_party/libyuv/libyuv.gyp:libyuv',
@@ -1221,6 +1228,11 @@
             }],
           ],
         }],
+        ['target_arch != "arm" and chromeos == 1 and use_x11 == 1', {
+          'sources': [
+            'filters/h264_bitstream_buffer_unittest.cc',
+          ],
+        }],
         ['use_alsa==0', {
           'sources!': [
             'audio/alsa/alsa_output_unittest.cc',