command_buffer: Implement EXT_blend_func_extended

gpu/command_buffer/service/shader_translator.h

Index: gpu/command_buffer/service/shader_translator.h
diff --git a/gpu/command_buffer/service/shader_translator.h b/gpu/command_buffer/service/shader_translator.h
index 6e7628ffa05f5900a153f3641650e14c27285a26..f0f647866544be19b747306b7774eaa5522d7318 100644
--- a/gpu/command_buffer/service/shader_translator.h
+++ b/gpu/command_buffer/service/shader_translator.h
@@ -24,6 +24,7 @@ namespace gles2 {
 
 // Mapping between variable name and info.
 typedef base::hash_map<std::string, sh::Attribute> AttributeMap;
+typedef std::vector<sh::Attribute> AttributeList;
 typedef base::hash_map<std::string, sh::Uniform> UniformMap;
 typedef base::hash_map<std::string, sh::Varying> VaryingMap;
 // Mapping between hashed name and original name.
@@ -56,6 +57,7 @@ class ShaderTranslatorInterface
                          AttributeMap* attrib_map,
                          UniformMap* uniform_map,
                          VaryingMap* varying_map,
+                         AttributeList* output_variable_list,
                          NameMap* name_map) const = 0;
 
   // Return a string that is unique for a specfic set of options that would
@@ -106,6 +108,7 @@ class GPU_EXPORT ShaderTranslator
                  AttributeMap* attrib_map,
                  UniformMap* uniform_map,
                  VaryingMap* varying_map,
+                 AttributeList* output_variable_list,
                  NameMap* name_map) const override;
 
   std::string GetStringForOptionsThatWouldAffectCompilation() const override;