12-bit vp9 video support

media/base/video_frame.cc

Index: media/base/video_frame.cc
diff --git a/media/base/video_frame.cc b/media/base/video_frame.cc
index f88dff3fdadb48efb7d44af3827ee9e82205aece..9e29dd4895bb98b173dcae46fd97e3a67a0b5407 100644
--- a/media/base/video_frame.cc
+++ b/media/base/video_frame.cc
@@ -121,7 +121,7 @@ bool VideoFrame::IsValidConfig(VideoPixelFormat format,
     return true;
 
   // Make sure new formats are properly accounted for in the method.
-  static_assert(PIXEL_FORMAT_MAX == 21,
+  static_assert(PIXEL_FORMAT_MAX == 24,
                 "Added pixel format, please review IsValidConfig()");
 
   if (format == PIXEL_FORMAT_UNKNOWN) {
@@ -524,6 +524,9 @@ size_t VideoFrame::NumPlanes(VideoPixelFormat format) {
     case PIXEL_FORMAT_YUV420P10:
     case PIXEL_FORMAT_YUV422P10:
     case PIXEL_FORMAT_YUV444P10:
+    case PIXEL_FORMAT_YUV420P12:
+    case PIXEL_FORMAT_YUV422P12:
+    case PIXEL_FORMAT_YUV444P12:
       return 3;
     case PIXEL_FORMAT_YV12A:
       return 4;
@@ -1014,11 +1017,13 @@ gfx::Size VideoFrame::SampleSize(VideoPixelFormat format, size_t plane) {
         case PIXEL_FORMAT_YV24:
         case PIXEL_FORMAT_YUV444P9:
         case PIXEL_FORMAT_YUV444P10:
+        case PIXEL_FORMAT_YUV444P12:
           return gfx::Size(1, 1);
 
         case PIXEL_FORMAT_YV16:
         case PIXEL_FORMAT_YUV422P9:
         case PIXEL_FORMAT_YUV422P10:
+        case PIXEL_FORMAT_YUV422P12:
           return gfx::Size(2, 1);
 
         case PIXEL_FORMAT_YV12:
@@ -1029,6 +1034,7 @@ gfx::Size VideoFrame::SampleSize(VideoPixelFormat format, size_t plane) {
         case PIXEL_FORMAT_MT21:
         case PIXEL_FORMAT_YUV420P9:
         case PIXEL_FORMAT_YUV420P10:
+        case PIXEL_FORMAT_YUV420P12:
           return gfx::Size(2, 2);
 
         case PIXEL_FORMAT_UNKNOWN:
@@ -1064,6 +1070,9 @@ int VideoFrame::BytesPerElement(VideoPixelFormat format, size_t plane) {
     case PIXEL_FORMAT_YUV420P10:
     case PIXEL_FORMAT_YUV422P10:
     case PIXEL_FORMAT_YUV444P10:
+    case PIXEL_FORMAT_YUV420P12:
+    case PIXEL_FORMAT_YUV422P12:
+    case PIXEL_FORMAT_YUV444P12:
       return 2;
     case PIXEL_FORMAT_NV12:
     case PIXEL_FORMAT_NV21: