Check for shader version mismatch

gpu/command_buffer/service/shader_manager.h

Index: gpu/command_buffer/service/shader_manager.h
diff --git a/gpu/command_buffer/service/shader_manager.h b/gpu/command_buffer/service/shader_manager.h
index 0c48b9932f918cac2d4fd30d78bbf85d4fedaf5f..c7355a815cc7e4978d0dfbb6357ef2ec4255253f 100644
--- a/gpu/command_buffer/service/shader_manager.h
+++ b/gpu/command_buffer/service/shader_manager.h
@@ -35,6 +35,8 @@ class GPU_EXPORT Shader : public base::RefCounted<Shader> {
     kShaderStateCompiled, // Signifies compile happened, not valid compile.
   };
 
+  static const int kUndefinedShaderVersion = -1;
+
   void RequestCompile(scoped_refptr<ShaderTranslatorInterface> translator,
                       TranslatedShaderSourceType type);
 
@@ -52,6 +54,10 @@ class GPU_EXPORT Shader : public base::RefCounted<Shader> {
     return shader_type_;
   }
 
+  int shader_version() const {
+    return shader_version_;
+  }
+
   const std::string& source() const {
     return source_;
   }
@@ -168,6 +174,10 @@ class GPU_EXPORT Shader : public base::RefCounted<Shader> {
   // Type of shader - GL_VERTEX_SHADER or GL_FRAGMENT_SHADER.
   GLenum shader_type_;
 
+  // Version of the shader. Can be kUndefinedShaderVersion or version returned
+  // by ANGLE.
+  int shader_version_;
+
   // Translated source type when shader was last requested to be compiled.
   TranslatedShaderSourceType source_type_;