command_buffer: Implement EXT_blend_func_extended

gpu/command_buffer/service/shader_manager.cc

Index: gpu/command_buffer/service/shader_manager.cc
diff --git a/gpu/command_buffer/service/shader_manager.cc b/gpu/command_buffer/service/shader_manager.cc
index 0ad8bf09bb71b03ba4a3cecbd954df7fa0662de2..ef8e5ef45149b3e4f0406d88b685ad0354661d70 100644
--- a/gpu/command_buffer/service/shader_manager.cc
+++ b/gpu/command_buffer/service/shader_manager.cc
@@ -69,14 +69,10 @@ void Shader::DoCompile() {
   const char* source_for_driver = last_compiled_source_.c_str();
   ShaderTranslatorInterface* translator = translator_.get();
   if (translator) {
-    bool success = translator->Translate(last_compiled_source_,
-                                         &log_info_,
-                                         &translated_source_,
-                                         &shader_version_,
-                                         &attrib_map_,
-                                         &uniform_map_,
-                                         &varying_map_,
-                                         &name_map_);
+    bool success = translator->Translate(
+        last_compiled_source_, &log_info_, &translated_source_,
+        &shader_version_, &attrib_map_, &uniform_map_, &varying_map_,
+        &output_variable_list_, &name_map_);
     if (!success) {
       return;
     }
@@ -214,11 +210,24 @@ const sh::Uniform* Shader::GetUniformInfo(const std::string& name) const {
   return it != uniform_map_.end() ? &it->second : NULL;
 }
 
-const sh::Varying* Shader::GetVaryingInfo(const std::string& name) const {
+const sh::Varying* Shader::GetInputVariableInfo(const std::string& name) const {
   VaryingMap::const_iterator it = varying_map_.find(GetTopVariableName(name));
   return it != varying_map_.end() ? &it->second : NULL;
 }
 
+const sh::OutputVariable* Shader::GetOutputVariableInfo(
+    const std::string& name) const {
+  std::string mappedName = GetTopVariableName(name);
+  // Number of output variables is expected to be so low that
+  // a linear search of a list should be faster than using a map.
+  auto iter =
+      std::find_if(output_variable_list_.begin(), output_variable_list_.end(),
+                   [mappedName](const sh::OutputVariable& output_var) {
+                     return output_var.mappedName == mappedName;
+                   });
+  return iter != output_variable_list_.end() ? &(*iter) : nullptr;
+}
+
 ShaderManager::ShaderManager() {}
 
 ShaderManager::~ShaderManager() {