command_buffer: Implement EXT_blend_func_extended

gpu/command_buffer/service/shader_manager.h

Index: gpu/command_buffer/service/shader_manager.h
diff --git a/gpu/command_buffer/service/shader_manager.h b/gpu/command_buffer/service/shader_manager.h
index c7355a815cc7e4978d0dfbb6357ef2ec4255253f..47fa45c85c6a7d2da6c03cfe1f6c6aeed89c952f 100644
--- a/gpu/command_buffer/service/shader_manager.h
+++ b/gpu/command_buffer/service/shader_manager.h
@@ -85,6 +85,7 @@ class GPU_EXPORT Shader : public base::RefCounted<Shader> {
   const sh::Attribute* GetAttribInfo(const std::string& name) const;
   const sh::Uniform* GetUniformInfo(const std::string& name) const;
   const sh::Varying* GetVaryingInfo(const std::string& name) const;
+  const sh::Attribute* GetOutputVariableInfo(const std::string& name) const;
 
   // If the original_name is not found, return NULL.
   const std::string* GetAttribMappedName(
@@ -126,6 +127,10 @@ class GPU_EXPORT Shader : public base::RefCounted<Shader> {
     return varying_map_;
   }
 
+  const AttributeList& output_variable_list() const {
+    return output_variable_list_;
+  }
+
   // Used by program cache.
   void set_attrib_map(const AttributeMap& attrib_map) {
     // copied because cache might be cleared
@@ -144,6 +149,12 @@ class GPU_EXPORT Shader : public base::RefCounted<Shader> {
     varying_map_ = VaryingMap(varying_map);
   }
 
+  // Used by program cache.
+  void set_output_variable_list(const AttributeList& output_variable_list) {
+    // copied because cache might be cleared
+    output_variable_list_ = output_variable_list;
+  }
+
  private:
   friend class base::RefCounted<Shader>;
   friend class ShaderManager;
@@ -203,6 +214,7 @@ class GPU_EXPORT Shader : public base::RefCounted<Shader> {
   AttributeMap attrib_map_;
   UniformMap uniform_map_;
   VaryingMap varying_map_;
+  AttributeList output_variable_list_;
 
   // The name hashing info when the shader was last compiled.
   NameMap name_map_;