Improve GL shader YUV adjustment.

cc/ipc/quads_struct_traits.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_IPC_QUADS_STRUCT_TRAITS_H_
 #define CC_IPC_QUADS_STRUCT_TRAITS_H_
 
 #include "cc/ipc/filter_operation_struct_traits.h"
 #include "cc/ipc/filter_operations_struct_traits.h"
 #include "cc/ipc/quads.mojom.h"
@@ skipping 368 matching lines @@
         cc::YUVVideoDrawQuad::MaterialCast(&input);
     return quad->resource_offset;
   }
 
   static float resource_multiplier(const cc::DrawQuad& input) {
     const cc::YUVVideoDrawQuad* quad =
         cc::YUVVideoDrawQuad::MaterialCast(&input);
     return quad->resource_multiplier;
   }
 
+  static float bits_per_channel(const cc::DrawQuad& input) {

[dcheng, 2016/07/28 01:54:26]

Isn't this a uint32 / int?

+    const cc::YUVVideoDrawQuad* quad =
+        cc::YUVVideoDrawQuad::MaterialCast(&input);
+    return quad->bits_per_channel;
+  }
+
   static bool Read(cc::mojom::YUVVideoQuadStateDataView data,
                    cc::DrawQuad* out);
 };
 
 template <>
 struct StructTraits<cc::mojom::DrawQuad, cc::DrawQuad> {
   static cc::DrawQuad::Material material(const cc::DrawQuad& quad) {
     return quad.material;
   }
 
@@ skipping 83 matching lines @@
       void* context);
   static QuadListArray quads(const cc::QuadList& quad_list) {
     return {quad_list.size(), const_cast<cc::QuadList*>(&quad_list)};
   }
   static bool Read(cc::mojom::QuadListDataView data, cc::QuadList* out);
 };
 
 }  // namespace mojo
 
 #endif  // CC_IPC_QUADS_STRUCT_TRAITS_H_