command_buffer: Implement EXT_blend_func_extended

gpu/command_buffer/service/shader_translator.cc

Index: gpu/command_buffer/service/shader_translator.cc
diff --git a/gpu/command_buffer/service/shader_translator.cc b/gpu/command_buffer/service/shader_translator.cc
index b852d2aa929cb2aa928a7e04d4d67517f141ab4c..616f95af819f720b98c9e603ae1b3840b6aa7f32 100644
--- a/gpu/command_buffer/service/shader_translator.cc
+++ b/gpu/command_buffer/service/shader_translator.cc
@@ -71,6 +71,11 @@ void GetVaryings(ShHandle compiler, VaryingMap* var_map) {
       (*var_map)[(*varyings)[ii].mappedName] = (*varyings)[ii];
   }
 }
+void GetOutputVariables(ShHandle compiler, AttributeList* var_list) {
+  if (!var_list)
+    return;
+  *var_list = *ShGetOutputVariables(compiler);
+}
 
 void GetNameHashingInfo(ShHandle compiler, NameMap* name_map) {
   if (!name_map)
@@ -160,7 +165,6 @@ bool ShaderTranslator::Init(GLenum shader_type,
 
   g_translator_initializer.Get();
 
-
   {
     TRACE_EVENT0("gpu", "ShConstructCompiler");
     compiler_ = ShConstructCompiler(shader_type, shader_spec,
@@ -192,6 +196,7 @@ bool ShaderTranslator::Translate(const std::string& shader_source,
                                  AttributeMap* attrib_map,
                                  UniformMap* uniform_map,
                                  VaryingMap* varying_map,
+                                 AttributeList* output_variable_list,
                                  NameMap* name_map) const {
   // Make sure this instance is initialized.
   DCHECK(compiler_ != NULL);
@@ -210,10 +215,11 @@ bool ShaderTranslator::Translate(const std::string& shader_source,
     }
     // Get shader version.
     *shader_version = ShGetShaderVersion(compiler_);
-    // Get info for attribs, uniforms, and varyings.
+    // Get info for attribs, uniforms, varyings and output variables.
     GetAttributes(compiler_, attrib_map);
     GetUniforms(compiler_, uniform_map);
     GetVaryings(compiler_, varying_map);
+    GetOutputVariables(compiler_, output_variable_list);
     // Get info for name hashing.
     GetNameHashingInfo(compiler_, name_map);
   }