Add GL_CHROMIUM_screen_space_antialiasing to support alternative AA

gpu/command_buffer/common/gles2_cmd_format_test_autogen.h

Index: gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
diff --git a/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h b/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
index 28cf3c681b7bb801773dfa77f8eb2f67e37b05be..70e538f844cb05df211d0f1182d657de0803e798 100644
--- a/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
+++ b/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
@@ -5164,4 +5164,14 @@ TEST_F(GLES2FormatTest, BlendBarrierKHR) {
   CheckBytesWrittenMatchesExpectedSize(next_cmd, sizeof(cmd));
 }
 
+TEST_F(GLES2FormatTest, ApplyScreenSpaceAntialiasing) {
+  cmds::ApplyScreenSpaceAntialiasing& cmd =
+      *GetBufferAs<cmds::ApplyScreenSpaceAntialiasing>();
+  void* next_cmd = cmd.Set(&cmd);
+  EXPECT_EQ(static_cast<uint32_t>(cmds::ApplyScreenSpaceAntialiasing::kCmdId),
+            cmd.header.command);
+  EXPECT_EQ(sizeof(cmd), cmd.header.size * 4u);
+  CheckBytesWrittenMatchesExpectedSize(next_cmd, sizeof(cmd));
+}
+
 #endif  // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_TEST_AUTOGEN_H_