Infrastructure for reading V8's initial snapshot from external files

chrome/chrome_android_paks.gypi

Index: chrome/chrome_android_paks.gypi
diff --git a/chrome/chrome_android_paks.gypi b/chrome/chrome_android_paks.gypi
index 90f02389d7f81c51fb16eae1ea3bec8fa84c02e6..574d5ccc545bf34fb0a83125a56f83f0808b4216 100644
--- a/chrome/chrome_android_paks.gypi
+++ b/chrome/chrome_android_paks.gypi
@@ -109,6 +109,16 @@
           '<(chrome_android_pak_output_folder)/icudtl.dat',
         ],
       }],
+      ['v8_use_external_startup_data==1', {
+        'chrome_android_pak_input_resources': [
+          '<(PRODUCT_DIR)/natives_blob.bin',
+          '<(PRODUCT_DIR)/snapshot_blob.bin',
+        ],
+        'chrome_android_pak_output_resources': [
+          '<(chrome_android_pak_output_folder)/natives_blob.bin',
+          '<(chrome_android_pak_output_folder)/snapshot_blob.bin',
+        ],
+      }],
     ],
   },
 }