V4L2VDA: use YV12 as output format if processor supports it.

media/gpu/v4l2_device.cc

Index: media/gpu/v4l2_device.cc
diff --git a/media/gpu/v4l2_device.cc b/media/gpu/v4l2_device.cc
index 0550438bb71ab4ce3cc08ce796b69aaa2b73ccb5..067bcd0df5ff234ef702888427b990ff6365173e 100644
--- a/media/gpu/v4l2_device.cc
+++ b/media/gpu/v4l2_device.cc
@@ -51,6 +51,9 @@ VideoPixelFormat V4L2Device::V4L2PixFmtToVideoPixelFormat(uint32_t pix_fmt) {
     case V4L2_PIX_FMT_YUV420M:
       return PIXEL_FORMAT_I420;
 
+    case V4L2_PIX_FMT_YVU420:
+      return PIXEL_FORMAT_YV12;
+
     case V4L2_PIX_FMT_RGB32:
       return PIXEL_FORMAT_ARGB;
 
@@ -72,6 +75,9 @@ uint32_t V4L2Device::VideoPixelFormatToV4L2PixFmt(VideoPixelFormat format) {
     case PIXEL_FORMAT_I420:
       return V4L2_PIX_FMT_YUV420M;
 
+    case PIXEL_FORMAT_YV12:
+      return V4L2_PIX_FMT_YVU420;
+
     default:
       LOG(FATAL) << "Add more cases as needed";
       return 0;
@@ -110,6 +116,9 @@ uint32_t V4L2Device::V4L2PixFmtToDrmFormat(uint32_t format) {
     case V4L2_PIX_FMT_YUV420M:
       return DRM_FORMAT_YUV420;
 
+    case V4L2_PIX_FMT_YVU420:
+      return DRM_FORMAT_YVU420;
+
     case V4L2_PIX_FMT_RGB32:
       return DRM_FORMAT_ARGB8888;