Enable VAAPI accelerated decode on Linux

content/common/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//content/common/common.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
 }
 
-if (is_chromeos && current_cpu != "arm") {
+if ((is_chromeos || is_linux) && current_cpu != "arm") {
   action("libva_generate_stubs") {
     extra_header = "gpu/media/va_stub_header.fragment"
 
     script = "../../tools/generate_stubs/generate_stubs.py"
     sources = [
       "gpu/media/va.sigs",
     ]
     inputs = [
       extra_header,
     ]
@@ skipping 315 matching lines @@
         "gpu/media/android_video_encode_accelerator.cc",
         "gpu/media/android_video_encode_accelerator.h",
       ]
     }
 
     if (mojo_media_host == "gpu") {
       deps += [ "//media/mojo/services:cdm_service" ]
     }
   }
 
-  if (is_chromeos) {
+  if (is_chromeos || is_linux) {
     sources += [
       "gpu/media/accelerated_video_decoder.h",
       "gpu/media/h264_decoder.cc",
       "gpu/media/h264_decoder.h",
       "gpu/media/h264_dpb.cc",
       "gpu/media/h264_dpb.h",
       "gpu/media/vp8_decoder.cc",
       "gpu/media/vp8_decoder.h",
       "gpu/media/vp8_picture.cc",
       "gpu/media/vp8_picture.h",
@@ skipping 23 matching lines @@
         "gpu/media/v4l2_slice_video_decode_accelerator.h",
         "gpu/media/v4l2_video_decode_accelerator.cc",
         "gpu/media/v4l2_video_decode_accelerator.h",
         "gpu/media/v4l2_video_encode_accelerator.cc",
         "gpu/media/v4l2_video_encode_accelerator.h",
       ]
       libs = [
         "EGL",
         "GLESv2",
       ]
-    }
-    if (current_cpu == "arm") {
-      sources += [
-        "gpu/media/tegra_v4l2_device.cc",
-        "gpu/media/tegra_v4l2_device.h",
-      ]
+      if (current_cpu == "arm") {
+        sources += [
+          "gpu/media/tegra_v4l2_device.cc",
+          "gpu/media/tegra_v4l2_device.h",
+        ]
+      }
     }
     if (current_cpu != "arm") {
       sources += [
                    "gpu/media/va_surface.h",
                    "gpu/media/vaapi_jpeg_decode_accelerator.cc",
                    "gpu/media/vaapi_jpeg_decode_accelerator.h",
                    "gpu/media/vaapi_jpeg_decoder.cc",
                    "gpu/media/vaapi_jpeg_decoder.h",
                    "gpu/media/vaapi_picture.cc",
                    "gpu/media/vaapi_picture.h",
@@ skipping 127 matching lines @@
     "//components/leveldb/public/interfaces",
     "//components/mus/public/interfaces",
     "//content/public/common:mojo_bindings",
     "//mojo/shell/public/interfaces",
     "//skia/public/interfaces",
     "//third_party/WebKit/public:mojo_bindings",
     "//ui/mojo/geometry:interfaces",
     "//url/mojo:url_mojom_origin",
   ]
 }