cc: custom bilinear filtering for YUV quad.

cc/output/shader.h

Index: cc/output/shader.h
diff --git a/cc/output/shader.h b/cc/output/shader.h
index 21b4a70de5aaac404dc18061f6483967841dddf7..39bff542c78869647b1e84e7ede83f3f4923b4eb 100644
--- a/cc/output/shader.h
+++ b/cc/output/shader.h
@@ -767,7 +767,10 @@ class FragmentShaderYUVVideo : public FragmentTexBlendMode {
   std::string GetShaderString(
       TexCoordPrecision precision, SamplerType sampler) const;
 
-  void SetFeatures(bool use_alpha_texture, bool use_nv12, bool use_color_lut);
+  void SetFeatures(SamplerType sampler,
+                   bool use_alpha_texture,
+                   bool use_nv12,
+                   bool use_color_lut);
 
   void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
@@ -781,6 +784,10 @@ class FragmentShaderYUVVideo : public FragmentTexBlendMode {
   int alpha_location() const { return alpha_location_; }
   int yuv_matrix_location() const { return yuv_matrix_location_; }
   int yuv_adj_location() const { return yuv_adj_location_; }
+  int ya_size_location() const { return ya_size_location_; }
+  int uv_subsampling_factor_location() const {
+    return uv_subsampling_factor_location_;
+  }
   int ya_clamp_rect_location() const { return ya_clamp_rect_location_; }
   int uv_clamp_rect_location() const { return uv_clamp_rect_location_; }
   int resource_multiplier_location() const {
@@ -789,6 +796,7 @@ class FragmentShaderYUVVideo : public FragmentTexBlendMode {
   int resource_offset_location() const { return resource_offset_location_; }
 
  private:
+  SamplerType sampler_ = SAMPLER_TYPE_2D;
   bool use_alpha_texture_;
   bool use_nv12_;
   bool use_color_lut_;
@@ -802,6 +810,8 @@ class FragmentShaderYUVVideo : public FragmentTexBlendMode {
   int alpha_location_;
   int yuv_matrix_location_;
   int yuv_adj_location_;
+  int ya_size_location_ = -1;
+  int uv_subsampling_factor_location_ = -1;
   int ya_clamp_rect_location_;
   int uv_clamp_rect_location_;
   int resource_multiplier_location_;