Name V8 snapshot according to target architecture (32/64 bit).

android_webview/snapshot_copying.gypi

Index: android_webview/snapshot_copying.gypi
diff --git a/android_webview/snapshot_copying.gypi b/android_webview/snapshot_copying.gypi
new file mode 100644
index 0000000000000000000000000000000000000000..1728cd6ae2fd7de8a241eb60d94f456c19476e70
--- /dev/null
+++ b/android_webview/snapshot_copying.gypi
@@ -0,0 +1,28 @@
+{
+  'variables': {
+    'snapshot_additional_input_paths': [],
+    'snapshot_copy_files': [],
+    'conditions': [
+      ['v8_use_external_startup_data==1 and (target_arch=="arm" or target_arch=="x86" or target_arch=="mips")', {
+        'snapshot_additional_input_paths': [
+          '<(asset_location)/natives_blob_32.bin',
+          '<(asset_location)/snapshot_blob_32.bin',
+        ],
+        'snapshot_copy_files': [
+          '<(PRODUCT_DIR)/natives_blob_32.bin',
+          '<(PRODUCT_DIR)/snapshot_blob_32.bin',
+        ],
+      }],
+      ['v8_use_external_startup_data==1 and (target_arch=="arm64" or target_arch=="x86_64" or target_arch=="mips64")', {
+        'snapshot_additional_input_paths': [
+          '<(asset_location)/natives_blob_64.bin',
+          '<(asset_location)/snapshot_blob_64.bin',
+        ],
+        'snapshot_copy_files': [
+          '<(PRODUCT_DIR)/natives_blob_64.bin',
+          '<(PRODUCT_DIR)/snapshot_blob_64.bin',
+        ],
+      }],
+    ],
+  },
+}