Enable sampling from DXGI NV12 formats in GLRenderer.

cc/output/shader.h

Index: cc/output/shader.h
diff --git a/cc/output/shader.h b/cc/output/shader.h
index 88b632e81b4bc9be92aa3f1aa822d711ce1535d5..836c9f57e05b28ea043cd7b1dd0b02adf990f74d 100644
--- a/cc/output/shader.h
+++ b/cc/output/shader.h
@@ -794,6 +794,37 @@ class FragmentShaderYUVVideo : public FragmentTexBlendMode {
   DISALLOW_COPY_AND_ASSIGN(FragmentShaderYUVVideo);
 };
 
+class FragmentShaderNV12Video : public FragmentTexBlendMode {
+ public:
+  FragmentShaderNV12Video();
+  std::string GetShaderString(TexCoordPrecision precision,
+                              SamplerType sampler) const;
+  static std::string GetShaderHead();
+  static std::string GetShaderBody();
+
+  void Init(gpu::gles2::GLES2Interface* context,
+            unsigned program,
+            int* base_uniform_index);
+  int y_texture_location() const { return y_texture_location_; }
+  int uv_texture_location() const { return uv_texture_location_; }
+  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_clamp_rect_location() const { return ya_clamp_rect_location_; }
+  int uv_clamp_rect_location() const { return uv_clamp_rect_location_; }
+
+ private:
+  int y_texture_location_;
+  int uv_texture_location_;
+  int alpha_location_;
+  int yuv_matrix_location_;
+  int yuv_adj_location_;
+  int ya_clamp_rect_location_;
+  int uv_clamp_rect_location_;
+
+  DISALLOW_COPY_AND_ASSIGN(FragmentShaderNV12Video);
+};
+
 class FragmentShaderYUVAVideo : public FragmentTexBlendMode {
  public:
   FragmentShaderYUVAVideo();