Add EncodeBackbufferCHROMIUM support to GLES2 command stream

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 59e9f492e6f757c7b542d19491f95b7ad580bf34..26ea6e8ccddd8e6bbfa85acc824ab814989a06f3 100644
--- a/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
+++ b/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
@@ -4498,5 +4498,17 @@ TEST_F(GLES2FormatTest, DrawBuffersEXTImmediate) {
   // TODO(gman): Check that data was inserted;
 }
 
+TEST_F(GLES2FormatTest, EncodeBackbufferCHROMIUM) {
+  cmds::EncodeBackbufferCHROMIUM& cmd =
+      *GetBufferAs<cmds::EncodeBackbufferCHROMIUM>();
+  void* next_cmd = cmd.Set(
+      &cmd);
+  EXPECT_EQ(static_cast<uint32>(cmds::EncodeBackbufferCHROMIUM::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_