gpu_fuzzer: cache shader translators

gpu/command_buffer/tests/fuzzer_main.cc

Index: gpu/command_buffer/tests/fuzzer_main.cc
diff --git a/gpu/command_buffer/tests/fuzzer_main.cc b/gpu/command_buffer/tests/fuzzer_main.cc
index 6aa843938ecdffbaec2b39a4523991bb196bf902..519556c57fa8d332dd64ca20ac3832980b8c735c 100644
--- a/gpu/command_buffer/tests/fuzzer_main.cc
+++ b/gpu/command_buffer/tests/fuzzer_main.cc
@@ -114,6 +114,13 @@ class CommandBufferSetup {
     CHECK(result);
     decoder_->set_max_bucket_size(8 << 20);
     context_group->buffer_manager()->set_max_buffer_size(8 << 20);
+    if (!vertex_translator_) {
+      // Keep a reference to the translators, which keeps them in the cache even
+      // after the decoder is reset. They are expensive to initialize, but they
+      // don't keep state.
+      vertex_translator_ = decoder_->GetTranslator(GL_VERTEX_SHADER);
+      fragment_translator_ = decoder_->GetTranslator(GL_FRAGMENT_SHADER);
+    }
   }
 
   void ResetDecoder() {
@@ -224,6 +231,9 @@ class CommandBufferSetup {
   std::unique_ptr<gles2::GLES2Decoder> decoder_;
   std::unique_ptr<CommandExecutor> executor_;
 
+  scoped_refptr<gles2::ShaderTranslatorInterface> vertex_translator_;
+  scoped_refptr<gles2::ShaderTranslatorInterface> fragment_translator_;
+
   scoped_refptr<Buffer> buffer_;
   int32_t buffer_id_ = 0;
 };