Make ShaderTranslatorCache thread safe

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 abf4c3e71b021a736c75d74e914a3348441f5b09..53157de8ed571f2b7d5bf8abc6d8845cd77ff969 100644
--- a/gpu/command_buffer/service/shader_translator.cc
+++ b/gpu/command_buffer/service/shader_translator.cc
@@ -9,6 +9,7 @@
 
 #include "base/at_exit.h"
 #include "base/debug/trace_event.h"
+#include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 
@@ -16,23 +17,21 @@ namespace {
 
 using gpu::gles2::ShaderTranslator;
 
-bool g_translator_initialized = false;
-
-void FinalizeShaderTranslator(void* /* dummy */) {
-  TRACE_EVENT0("gpu", "ShFinalize");
-  ShFinalize();
-  g_translator_initialized = false;
-}
-
-bool InitializeShaderTranslator() {
-  if (!g_translator_initialized) {
+class ShaderTranslatorInitializer {
+ public:
+  ShaderTranslatorInitializer() {
     TRACE_EVENT0("gpu", "ShInitialize");
     CHECK(ShInitialize());
-    base::AtExitManager::RegisterCallback(&FinalizeShaderTranslator, NULL);
-    g_translator_initialized = true;
   }
-  return g_translator_initialized;
-}
+
+  ~ShaderTranslatorInitializer() {
+    TRACE_EVENT0("gpu", "ShFinalize");
+    ShFinalize();
+  }
+};
+
+base::LazyInstance<ShaderTranslatorInitializer> g_translator_initializer =
+    LAZY_INSTANCE_INITIALIZER;
 
 #if !defined(ANGLE_SH_VERSION) || ANGLE_SH_VERSION < 108
 typedef int ANGLEGetInfoType;
@@ -135,8 +134,7 @@ bool ShaderTranslator::Init(
   DCHECK(shader_spec == SH_GLES2_SPEC || shader_spec == SH_WEBGL_SPEC);
   DCHECK(resources != NULL);
 
-  if (!InitializeShaderTranslator())
-    return false;
+  g_translator_initializer.Get();
 
   ShShaderOutput shader_output =
       (glsl_implementation_type == kGlslES ? SH_ESSL_OUTPUT : SH_GLSL_OUTPUT);