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

android_webview/android_webview.gyp

Index: android_webview/android_webview.gyp
diff --git a/android_webview/android_webview.gyp b/android_webview/android_webview.gyp
index 10f98b83c9c339628588429b7a441632b96ac5b7..86b2b2d6ab487d35bda1f3a54161c445ad087507 100644
--- a/android_webview/android_webview.gyp
+++ b/android_webview/android_webview.gyp
@@ -56,6 +56,50 @@
             }
           ],
         }],
+        ['v8_use_external_startup_data==1', {
+          'variables': {
+            'conditions': [
+              ['(target_arch=="arm" or target_arch=="x86" or target_arch=="mips")', {
+                'arch_suffix':'32'
+              }],
+              ['(target_arch=="arm64" or target_arch=="x86_64" or target_arch=="mips64")', {
+                'arch_suffix':'64'
+              }],
+            ],
+          },
+          'actions': [
+            {
+              'action_name': 'rename_snapshot_blob',
+              'inputs': [
+                '<(PRODUCT_DIR)/snapshot_blob.bin',
+              ],
+              'outputs': [
+                '<(PRODUCT_DIR)/snapshot_blob_<(arch_suffix).bin',
+              ],
+              'action': [
+                'python',
+                '<(DEPTH)/build/cp.py',
+                '<@(_inputs)',
+                '<@(_outputs)',
+              ],
+            },
+            {
+              'action_name': 'rename_natives_blob',
+              'inputs': [
+                '<(PRODUCT_DIR)/natives_blob.bin',
+              ],
+              'outputs': [
+                '<(PRODUCT_DIR)/natives_blob_<(arch_suffix).bin',
+              ],
+              'action': [
+                'python',
+                '<(DEPTH)/build/cp.py',
+                '<@(_inputs)',
+                '<@(_outputs)',
+              ],
+            },
+          ],
+        }],
       ],
     },
     {