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 58ba69f6dd8bf95147c95e3c22afe9045be9caa3..5a4914d9f9b34889902f753f5a620c7c0805992a 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::OutputVariable> OutputVariableList;
 typedef base::hash_map<std::string, sh::Uniform> UniformMap;
 typedef base::hash_map<std::string, sh::Varying> VaryingMap;
 typedef base::hash_map<std::string, sh::InterfaceBlock> InterfaceBlockMap;
@@ -58,6 +59,7 @@ class ShaderTranslatorInterface
                          UniformMap* uniform_map,
                          VaryingMap* varying_map,
                          InterfaceBlockMap* interface_block_map,
+                         OutputVariableList* output_variable_list,
                          NameMap* name_map) const = 0;
 
   // Return a string that is unique for a specfic set of options that would
@@ -109,6 +111,7 @@ class GPU_EXPORT ShaderTranslator
                  UniformMap* uniform_map,
                  VaryingMap* varying_map,
                  InterfaceBlockMap* interface_block_map,
+                 OutputVariableList* output_variable_list,
                  NameMap* name_map) const override;
 
   std::string GetStringForOptionsThatWouldAffectCompilation() const override;