Improve GL shader YUV adjustment.

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 b5029713adeef38790dee2d9d21f4eb6e7a31015..a13bca28f8fa7af52e953ccd1268fb887062e76e 100644
--- a/cc/quads/yuv_video_draw_quad.cc
+++ b/cc/quads/yuv_video_draw_quad.cc
@@ -32,7 +32,8 @@ void YUVVideoDrawQuad::SetNew(const SharedQuadState* shared_quad_state,
                               unsigned a_plane_resource_id,
                               ColorSpace color_space,
                               float offset,
-                              float multiplier) {
+                              float multiplier,
+                              int bits_per_channel) {
   bool needs_blending = false;
   DrawQuad::SetAll(shared_quad_state, DrawQuad::YUV_VIDEO_CONTENT, rect,
                    opaque_rect, visible_rect, needs_blending);
@@ -48,6 +49,7 @@ void YUVVideoDrawQuad::SetNew(const SharedQuadState* shared_quad_state,
   this->color_space = color_space;
   this->resource_offset = offset;
   this->resource_multiplier = multiplier;
+  this->bits_per_channel = bits_per_channel;
 }
 
 void YUVVideoDrawQuad::SetAll(const SharedQuadState* shared_quad_state,
@@ -65,7 +67,8 @@ void YUVVideoDrawQuad::SetAll(const SharedQuadState* shared_quad_state,
                               unsigned a_plane_resource_id,
                               ColorSpace color_space,
                               float offset,
-                              float multiplier) {
+                              float multiplier,
+                              int bits_per_channel) {
   DrawQuad::SetAll(shared_quad_state, DrawQuad::YUV_VIDEO_CONTENT, rect,
                    opaque_rect, visible_rect, needs_blending);
   this->ya_tex_coord_rect = ya_tex_coord_rect;
@@ -80,6 +83,7 @@ void YUVVideoDrawQuad::SetAll(const SharedQuadState* shared_quad_state,
   this->color_space = color_space;
   this->resource_offset = offset;
   this->resource_multiplier = multiplier;
+  this->bits_per_channel = bits_per_channel;
 }
 
 const YUVVideoDrawQuad* YUVVideoDrawQuad::MaterialCast(