Add use_v4l2_codec use flag to include v4l2 codec on x86 CrOS.

content/content_common.gypi

Index: content/content_common.gypi
diff --git a/content/content_common.gypi b/content/content_common.gypi
index 69ec5334c2a6509f09da693356ae524130d7ad8e..06f891536bc1e3f4f4b2aed6a2d43210124fab6c 100644
--- a/content/content_common.gypi
+++ b/content/content_common.gypi
@@ -31,6 +31,7 @@
     '../third_party/WebKit/public/blink_headers.gyp:blink_headers',
   ],
   'variables': {
+    'use_v4l2_codec%': 0,
     'public_common_sources': [
       'public/common/appcache_info.h',
       'public/common/bindings_policy.h',
@@ -759,15 +760,13 @@
         '../third_party/libjingle/libjingle.gyp:libjingle',
       ],
     }],
-    ['target_arch=="arm" and chromeos == 1 and use_x11 == 1', {
+    ['chromeos==1 and ((target_arch=="arm" and use_x11==1) or use_v4l2_codec==1)', {
       'dependencies': [
         '../media/media.gyp:media',
       ],
       'sources': [
         'common/gpu/media/generic_v4l2_video_device.cc',
         'common/gpu/media/generic_v4l2_video_device.h',
-        'common/gpu/media/tegra_v4l2_video_device.cc',
-        'common/gpu/media/tegra_v4l2_video_device.h',
         'common/gpu/media/v4l2_image_processor.cc',
         'common/gpu/media/v4l2_image_processor.h',
         'common/gpu/media/v4l2_video_decode_accelerator.cc',
@@ -780,6 +779,14 @@
       'include_dirs': [
         '<(DEPTH)/third_party/khronos',
       ],
+      'conditions': [
+        ['target_arch == "arm"', {
+          'sources': [
+            'common/gpu/media/tegra_v4l2_video_device.cc',
+            'common/gpu/media/tegra_v4l2_video_device.h',
+          ],
+        }],
+      ],
     }],
     ['target_arch != "arm" and chromeos == 1', {
       'dependencies': [