Steps to reproduce the problem:
1. add 
+dist_aar("content_shell_aar") {
+  testonly = true
+  deps = [ ":content_shell_java" ]
+  output = "$root_build_dir/MyLibrary.aar"
+}
to content/shell/android/BUILD.gn

2. ninja -C out/my_path content_shell_aar
3. use the $root_build_dir/MyLibrary.aar and content/shell/shell_apk to generate an apk by android studio

What is the expected behavior?

What went wrong?
from the file attached, some resources are malformed

for example, common_google_signin_btn_text_dark_normal_background.9.png in android_tools is 740 bytes long
but in aar, it is 960 bytes long.

I guess it's a bug of android_resources function in the build/config/android/rules.gni

WebStore page: 

Did this work before? N/A 

Chrome version: 65.0.3325.149  Channel: stable
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