Add test that attemps to translate a shader twice

gpu/command_buffer/service/shader_translator_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <GLES2/gl2.h>
 
 #include "gpu/command_buffer/service/shader_translator.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gl/gl_version_info.h"
 
@@ skipping 399 matching lines @@
   EXPECT_EQ(1u, interface_block_map.size());
   InterfaceBlockMap::const_iterator iter;
   for (iter = interface_block_map.begin();
        iter != interface_block_map.end(); ++iter) {
     if (iter->second.name == "Color")
       break;
   }
   EXPECT_TRUE(iter != interface_block_map.end());
 }
 
+TEST_F(ES3ShaderTranslatorTest, CompileTwice) {
+  const char* vs1 = "void main() { gl_Position = vec5(gl_DepthRange); }";
+
+  std::string info_log, translated_source;
+  int shader_version;
+  AttributeMap attrib_map;
+  UniformMap uniform_map;
+  VaryingMap varying_map;
+  InterfaceBlockMap interface_block_map;
+  OutputVariableList output_variable_list;
+  NameMap name_map;
+  vertex_translator_->Translate(
+      vs1, &info_log, &translated_source, &shader_version, &attrib_map,
+      &uniform_map, &varying_map, &interface_block_map, &output_variable_list,
+      &name_map);
+  vertex_translator_->Translate(
+      vs1, &info_log, &translated_source, &shader_version, &attrib_map,
+      &uniform_map, &varying_map, &interface_block_map, &output_variable_list,
+      &name_map);
+}
+
 TEST_F(ShaderTranslatorTest, OptionsString) {
   scoped_refptr<ShaderTranslator> translator_1 = new ShaderTranslator();
   scoped_refptr<ShaderTranslator> translator_2 = new ShaderTranslator();
   scoped_refptr<ShaderTranslator> translator_3 = new ShaderTranslator();
 
   ShBuiltInResources resources;
   ShInitBuiltInResources(&resources);
 
   ASSERT_TRUE(translator_1->Init(GL_VERTEX_SHADER, SH_GLES2_SPEC, &resources,
                                  SH_GLSL_150_CORE_OUTPUT,
@@ skipping 183 matching lines @@
                         ShaderTranslatorOutputVersionTest,
                         testing::Values(make_gl_glsl_tuple("opengl es 2.0", ""),
                                         make_gl_glsl_tuple("opengl es 3.0", ""),
                                         make_gl_glsl_tuple("opengl es 3.1", ""),
                                         make_gl_glsl_tuple("opengl es 3.2",
                                                            "")));
 
 }  // namespace gles2
 }  // namespace gpu