Adding YUVA support for enabling Alpha Playback

cc/quads/yuv_video_draw_quad.cc

Index: cc/quads/yuv_video_draw_quad.cc
diff --git a/cc/quads/yuv_video_draw_quad.cc b/cc/quads/yuv_video_draw_quad.cc
index 7876861bd878578bf38d9e91a4d3db3fb4c9f024..7ac1ed7acfb4ae1154a94f6c6b0b6567eee71c45 100644
--- a/cc/quads/yuv_video_draw_quad.cc
+++ b/cc/quads/yuv_video_draw_quad.cc
@@ -24,6 +24,33 @@ void YUVVideoDrawQuad::SetNew(const SharedQuadState* shared_quad_state,
                               const VideoLayerImpl::FramePlane& v_plane) {
   gfx::Rect visible_rect = rect;
   bool needs_blending = false;
+  SetAll(shared_quad_state, rect, opaque_rect, visible_rect, needs_blending,
+         tex_scale, y_plane, u_plane, v_plane, a_plane);
+}
+
+void YUVVideoDrawQuad::SetNew(const SharedQuadState* shared_quad_state,
+                               gfx::Rect rect,
+                               gfx::Rect opaque_rect,
+                               gfx::SizeF tex_scale,
+                               const VideoLayerImpl::FramePlane& y_plane,
+                               const VideoLayerImpl::FramePlane& u_plane,
+                               const VideoLayerImpl::FramePlane& v_plane,
+                               const VideoLayerImpl::FramePlane& a_plane) {
+  gfx::Rect visible_rect = rect;
+  bool needs_blending = true;
+  SetAll(shared_quad_state, rect, opaque_rect, visible_rect, needs_blending,
+         tex_scale, y_plane, u_plane, v_plane, a_plane);
+}
+
+void YUVVideoDrawQuad::SetAll(const SharedQuadState* shared_quad_state,
+                              gfx::Rect rect,
+                              gfx::Rect opaque_rect,
+                              gfx::Rect visible_rect,
+                              bool needs_blending,
+                              gfx::SizeF tex_scale,
+                              const VideoLayerImpl::FramePlane& y_plane,
+                              const VideoLayerImpl::FramePlane& u_plane,
+                              const VideoLayerImpl::FramePlane& v_plane) {
   DrawQuad::SetAll(shared_quad_state, DrawQuad::YUV_VIDEO_CONTENT, rect,
                    opaque_rect, visible_rect, needs_blending);
   this->tex_scale = tex_scale;
@@ -40,13 +67,15 @@ void YUVVideoDrawQuad::SetAll(const SharedQuadState* shared_quad_state,
                               gfx::SizeF tex_scale,
                               const VideoLayerImpl::FramePlane& y_plane,
                               const VideoLayerImpl::FramePlane& u_plane,
-                              const VideoLayerImpl::FramePlane& v_plane) {
-  DrawQuad::SetAll(shared_quad_state, DrawQuad::YUV_VIDEO_CONTENT, rect,
+                              const VideoLayerImpl::FramePlane& v_plane,
+                              const VideoLayerImpl::FramePlane& a_plane) {
+  DrawQuad::SetAll(shared_quad_state, DrawQuad::YUVA_VIDEO_CONTENT, rect,
                    opaque_rect, visible_rect, needs_blending);
   this->tex_scale = tex_scale;
   this->y_plane = y_plane;
   this->u_plane = u_plane;
   this->v_plane = v_plane;
+  this->a_plane = a_plane;
 }
 
 void YUVVideoDrawQuad::IterateResources(
@@ -54,11 +83,15 @@ void YUVVideoDrawQuad::IterateResources(
   y_plane.resource_id = callback.Run(y_plane.resource_id);
   u_plane.resource_id = callback.Run(u_plane.resource_id);
   v_plane.resource_id = callback.Run(v_plane.resource_id);
+  if(a_plane.resource_id) {
+    a_plane.resource_id = callback.Run(a_plane.resource_id);
+  }
 }
 
 const YUVVideoDrawQuad* YUVVideoDrawQuad::MaterialCast(
     const DrawQuad* quad) {
-  DCHECK(quad->material == DrawQuad::YUV_VIDEO_CONTENT);
+  DCHECK(quad->material == DrawQuad::YUV_VIDEO_CONTENT ||
+         quad->material == DrawQuad::YUVA_VIDEO_CONTENT);
   return static_cast<const YUVVideoDrawQuad*>(quad);
 }