Added support for EXT_frag_depth

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 dfb94c395022853daa2ff64ce473c9ed67347513..6d42cf6e98b856bd2f016039c658aa2de426c7a0 100644
--- a/gpu/command_buffer/service/shader_translator.cc
+++ b/gpu/command_buffer/service/shader_translator.cc
@@ -199,7 +199,7 @@ bool ShaderTranslator::Translate(const char* shader) {
 
 std::string ShaderTranslator::GetStringForOptionsThatWouldEffectCompilation()
     const {
-  const size_t kNumIntFields = 15;
+  const size_t kNumIntFields = 16;
   const size_t kNumEnumFields = 1;
   const size_t kNumFunctionPointerFields = 1;
   struct MustMatchShBuiltInResource {
@@ -248,7 +248,9 @@ std::string ShaderTranslator::GetStringForOptionsThatWouldEffectCompilation()
       ":MaxExpressionComplexity:" +
       base::IntToString(compiler_options_.MaxExpressionComplexity) +
       ":MaxCallStackDepth:" +
-      base::IntToString(compiler_options_.MaxCallStackDepth));
+      base::IntToString(compiler_options_.MaxCallStackDepth) +
+      ":EXT_frag_depth:" +
+      base::IntToString(compiler_options_.EXT_frag_depth));
 }
 
 const char* ShaderTranslator::translated_shader() const {