Add new test for WebGL 2 code size in binary encoded singlefile mode.…

… Improvement from previous base64 encoding to binary encoding is:

size of a.html == 17586, expected 18839, delta=-1253 (-6.65%)
size of a.html.gz == 10152, expected 10973, delta=-821 (-7.48%)
Total output size=17586 bytes, expected total size=18839, delta=-1253 (-6.65%)
Total output size gzipped=10152 bytes, expected total size gzipped=10973, delta=-821 (-7.48%)
Hey amazing, overall generated code size was improved by 1253 bytes!

test/code_size/hello_webgl2_wasm_singlefile_wasm.json

@@ -0,0 +1,6 @@
+{
+  "a.html": 17586,
+  "a.html.gz": 10152,
+  "total": 17586,
+  "total_gz": 10152
+}

test/other/codesize/test_codesize_files_wasmfs.size

@@ -1 +1 @@
-50948
+50942

test/test_other.py

@@ -8536,7 +8536,7 @@ def test_unoptimized_code_size(self):
     # We don't care too about unoptimized code size but we would like to keep it
     # under control to a certain extent.  This test allows us to track major
     # changes to the size of the unoptimized and unminified code size.
-    # Run with `--rebase` when this test fails.
+    # Run with `--rebaseline` when this test fails.
     self.build(test_file('hello_world.c'), emcc_args=['-O0', '--output_eol=linux'])
     self.check_expected_size_in_file('wasm',
                                      test_file('other/test_unoptimized_code_size.wasm.size'),
@@ -10920,6 +10920,7 @@ def test_function_exports_are_small(self, args, opt, closure):
     'random_printf_wasm2js': ('random_printf', True),
     'hello_webgl_wasm': ('hello_webgl', False),
     'hello_webgl_wasm2js': ('hello_webgl', True),
+    'hello_webgl2_wasm_singlefile': ('hello_webgl2_wasm_singlefile', False),
     'hello_webgl2_wasm': ('hello_webgl2', False),
     'hello_webgl2_wasm2js': ('hello_webgl2', True),
     'math': ('math', False),
@@ -10966,6 +10967,7 @@ def test_minimal_runtime_code_size(self, test_name, js, compare_js_output=False)
                            '-lGL',
                            '-sMODULARIZE']
     hello_webgl2_sources = hello_webgl_sources + ['-sMAX_WEBGL_VERSION=2']
+    hello_webgl2_wasm_singlefile_sources = hello_webgl2_sources + ['-sSINGLE_FILE']
     hello_wasm_worker_sources = [test_file('wasm_worker/wasm_worker_code_size.c'), '-sWASM_WORKERS', '-sENVIRONMENT=web,worker']
     embind_hello_sources = [test_file('code_size/embind_hello_world.cpp'), '-lembind']
     embind_val_sources = [test_file('code_size/embind_val_hello_world.cpp'),
@@ -10980,6 +10982,7 @@ def test_minimal_runtime_code_size(self, test_name, js, compare_js_output=False)
       'hello_webgl': hello_webgl_sources,
       'math': math_sources,
       'hello_webgl2': hello_webgl2_sources,
+      'hello_webgl2_wasm_singlefile': hello_webgl2_wasm_singlefile_sources,
       'hello_wasm_worker': hello_wasm_worker_sources,
       'embind_val': embind_val_sources,
       'embind_hello': embind_hello_sources,