Compress sources of JS libraries in addition to the snapshot.

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
diff --git a/tools/gyp/v8.gyp b/tools/gyp/v8.gyp
index 7ad8b917091fb7397bb1c492cff0864a328737ed..4eccff282fdb044804485e9b64c48e15b69aa0d3 100644
--- a/tools/gyp/v8.gyp
+++ b/tools/gyp/v8.gyp
@@ -30,7 +30,7 @@
     'use_system_v8%': 0,
     'msvs_use_common_release': 0,
     'gcc_version%': 'unknown',
-    'v8_compress_startup_data%': 'false',
+    'v8_compress_startup_data%': 'off',
     'v8_target_arch%': '<(target_arch)',
 
     # Setting 'v8_can_use_unaligned_accesses' to 'true' will allow the code
@@ -789,6 +789,12 @@
                   '../../src/platform-linux.cc',
                   '../../src/platform-posix.cc'
                 ],
+                'conditions': [
+                  ['v8_compress_startup_data=="bz2"', {
+                    'sources': [
+                      '../../src/bz2-decompress.cc',
+                  ]}],
+                ]
               }
             ],
             ['OS=="android"', {
@@ -902,6 +908,7 @@
                 '../../tools/js2c.py',
                 '<@(_outputs)',
                 'CORE',
+                '<(v8_compress_startup_data)',
                 '<@(library_files)'
               ],
             },
@@ -919,6 +926,7 @@
                 '../../tools/js2c.py',
                 '<@(_outputs)',
                 'EXPERIMENTAL',
+                '<(v8_compress_startup_data)',
                 '<@(experimental_library_files)'
               ],
             },