Android: Add APK patch size estimates to resource_sizes.py.

build/android/binary_size/apk_downloader.py

Index: build/android/binary_size/apk_downloader.py
diff --git a/build/android/binary_size/update_apks.py b/build/android/binary_size/apk_downloader.py
similarity index 95%
rename from build/android/binary_size/update_apks.py
rename to build/android/binary_size/apk_downloader.py
index a197e64a12675e47c5583878e17ff81080b47a2f..b90fe5f92c98870f5c9aa7218bc14e8188e68109 100755
--- a/build/android/binary_size/update_apks.py
+++ b/build/android/binary_size/apk_downloader.py
@@ -23,13 +23,16 @@ DEFAULT_APK = 'MonochromePublic.apk'
 
 
 def MaybeDownloadApk(builder, milestone, apk, download_path, bucket):
+  """Returns path to the downloaded APK or None if not found."""
   apk_path = os.path.join(download_path, builder, milestone, apk)
   sha1_path = apk_path + '.sha1'
   base_url = os.path.join(bucket, builder, milestone)
   if os.path.exists(apk_path):
     print '%s already exists' % apk_path
+    return apk_path
   elif not os.path.exists(sha1_path):
     print 'Skipping %s, file not found' % sha1_path
+    return None
   else:
     download_from_google_storage.download_from_google_storage(
         input_filename=sha1_path,
@@ -46,6 +49,7 @@ def MaybeDownloadApk(builder, milestone, apk, download_path, bucket):
         verbose=True,
         auto_platform=False,
         extract=False)
+    return apk_path
 
 
 def main():