Revert of Remove wasm compile time option and enable wasm behind a runtime flag.

tools/gyp/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 628 matching lines @@
         '../../src/compiler/type-hint-analyzer.cc',
         '../../src/compiler/type-hint-analyzer.h',
         '../../src/compiler/type-hints.cc',
         '../../src/compiler/type-hints.h',
         '../../src/compiler/typer.cc',
         '../../src/compiler/typer.h',
         '../../src/compiler/value-numbering-reducer.cc',
         '../../src/compiler/value-numbering-reducer.h',
         '../../src/compiler/verifier.cc',
         '../../src/compiler/verifier.h',
-        '../../src/compiler/wasm-compiler.cc',
-        '../../src/compiler/wasm-compiler.h',
-        '../../src/compiler/wasm-linkage.cc',
         '../../src/compiler/zone-pool.cc',
         '../../src/compiler/zone-pool.h',
         '../../src/compiler.cc',
         '../../src/compiler.h',
         '../../src/context-measure.cc',
         '../../src/context-measure.h',
         '../../src/contexts-inl.h',
         '../../src/contexts.cc',
         '../../src/contexts.h',
         '../../src/conversions-inl.h',
@@ skipping 400 matching lines @@
         '../../src/v8.cc',
         '../../src/v8.h',
         '../../src/v8memory.h',
         '../../src/v8threads.cc',
         '../../src/v8threads.h',
         '../../src/vector.h',
         '../../src/version.cc',
         '../../src/version.h',
         '../../src/vm-state-inl.h',
         '../../src/vm-state.h',
-        '../../src/wasm/asm-wasm-builder.cc',
-        '../../src/wasm/asm-wasm-builder.h',
-        '../../src/wasm/ast-decoder.cc',
-        '../../src/wasm/ast-decoder.h',
-        '../../src/wasm/decoder.h',
-        '../../src/wasm/encoder.cc',
-        '../../src/wasm/encoder.h',
-        '../../src/wasm/module-decoder.cc',
-        '../../src/wasm/module-decoder.h',
-        '../../src/wasm/wasm-js.cc',
-        '../../src/wasm/wasm-js.h',
-        '../../src/wasm/wasm-macro-gen.h',
-        '../../src/wasm/wasm-module.cc',
-        '../../src/wasm/wasm-module.h',
-        '../../src/wasm/wasm-opcodes.cc',
-        '../../src/wasm/wasm-opcodes.h',
-        '../../src/wasm/wasm-result.cc',
-        '../../src/wasm/wasm-result.h',
         '../../src/zone.cc',
         '../../src/zone.h',
         '../../src/zone-allocator.h',
         '../../src/zone-containers.h',
         '../../src/third_party/fdlibm/fdlibm.cc',
         '../../src/third_party/fdlibm/fdlibm.h',
       ],
       'conditions': [
         ['want_separate_host_toolset==1', {
           'toolsets': ['host', 'target'],
@@ skipping 393 matching lines @@
           'defines': ['ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_FILE'],
         }, { # else icu_use_data_file_flag !=1
           'conditions': [
             ['OS=="win"', {
               'defines': ['ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_SHARED'],
             }, {
               'defines': ['ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_STATIC'],
             }],
           ],
         }],
+        ['v8_wasm!=0', {
+          'sources': [
+            '../../src/compiler/wasm-compiler.cc',
+            '../../src/compiler/wasm-compiler.h',
+            '../../src/compiler/wasm-linkage.cc',
+            '../../src/wasm/asm-wasm-builder.cc',
+            '../../src/wasm/asm-wasm-builder.h',
+            '../../src/wasm/ast-decoder.cc',
+            '../../src/wasm/ast-decoder.h',
+            '../../src/wasm/decoder.h',
+            '../../src/wasm/encoder.cc',
+            '../../src/wasm/encoder.h',
+            '../../src/wasm/module-decoder.cc',
+            '../../src/wasm/module-decoder.h',
+            '../../src/wasm/wasm-js.cc',
+            '../../src/wasm/wasm-js.h',
+            '../../src/wasm/wasm-macro-gen.h',
+            '../../src/wasm/wasm-module.cc',
+            '../../src/wasm/wasm-module.h',
+            '../../src/wasm/wasm-opcodes.cc',
+            '../../src/wasm/wasm-opcodes.h',
+            '../../src/wasm/wasm-result.cc',
+            '../../src/wasm/wasm-result.h',
+          ],
+        }],
       ],
     },
     {
       'target_name': 'v8_libbase',
       'type': 'static_library',
       'variables': {
         'optimize': 'max',
       },
       'include_dirs+': [
         '../..',
@@ skipping 597 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }