Adding YUVA support for enabling Alpha Playback

content/common/cc_messages.cc

Index: content/common/cc_messages.cc
diff --git a/content/common/cc_messages.cc b/content/common/cc_messages.cc
index 4313e1a1175ad8c69ae2bb95d18f0803ea17706b..b7ea68754cd87433c375baf8166372326c242964 100644
--- a/content/common/cc_messages.cc
+++ b/content/common/cc_messages.cc
@@ -333,6 +333,9 @@ void ParamTraits<cc::RenderPass>::Write(
       case cc::DrawQuad::YUV_VIDEO_CONTENT:
         WriteParam(m, *cc::YUVVideoDrawQuad::MaterialCast(quad));
         break;
+      case cc::DrawQuad::YUVA_VIDEO_CONTENT:
+        WriteParam(m, *cc::YUVAVideoDrawQuad::MaterialCast(quad));
+        break;
       case cc::DrawQuad::INVALID:
         break;
     }
@@ -447,6 +450,9 @@ bool ParamTraits<cc::RenderPass>::Read(
       case cc::DrawQuad::YUV_VIDEO_CONTENT:
         draw_quad = ReadDrawQuad<cc::YUVVideoDrawQuad>(m, iter);
         break;
+      case cc::DrawQuad::YUVA_VIDEO_CONTENT:
+        draw_quad = ReadDrawQuad<cc::YUVAVideoDrawQuad>(m, iter);
+        break;
       case cc::DrawQuad::INVALID:
         break;
     }
@@ -526,6 +532,9 @@ void ParamTraits<cc::RenderPass>::Log(
       case cc::DrawQuad::YUV_VIDEO_CONTENT:
         LogParam(*cc::YUVVideoDrawQuad::MaterialCast(quad), l);
         break;
+      case cc::DrawQuad::YUVA_VIDEO_CONTENT:
+        LogParam(*cc::YUVAVideoDrawQuad::MaterialCast(quad), l);
+        break;
       case cc::DrawQuad::INVALID:
         break;
     }