Teach resource_sizes about unwind_cfi

Bug: 819888
Change-Id: I648353f7f4fa6790f63d4d4eca711c1d48d2092e
Reviewed-on: https://chromium-review.googlesource.com/995585
Commit-Queue: agrieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548092}

build/android/resource_sizes.py

@@ -370,6 +370,7 @@ def PrintApkAnalysis(apk_filename, tool_prefix, out_dir, chartjson=None):
   metadata = make_group('Package metadata')
   unknown = make_group('Unknown files')
   notices = make_group('licenses.notice file')
+  unwind_cfi = make_group('unwind_cfi (dev and canary only)')
 
   apk = zipfile.ZipFile(apk_filename, 'r')
   try:
@@ -412,6 +413,8 @@ def PrintApkAnalysis(apk_filename, tool_prefix, out_dir, chartjson=None):
       metadata.AddZipInfo(member)
     elif filename.endswith('.notice'):
       notices.AddZipInfo(member)
+    elif filename.startswith('assets/unwind_cfi'):
+      unwind_cfi.AddZipInfo(member)
     else:
       unknown.AddZipInfo(member)
 
@@ -492,6 +495,8 @@ def PrintApkAnalysis(apk_filename, tool_prefix, out_dir, chartjson=None):
 
   # Main metric that we want to monitor for jumps.
   normalized_apk_size = total_apk_size
+  # unwind_cfi exists only in dev, canary, and non-channel builds.
+  normalized_apk_size -= unwind_cfi.ComputeZippedSize()
   # Always look at uncompressed .so.
   normalized_apk_size -= native_code.ComputeZippedSize()
   normalized_apk_size += native_code.ComputeUncompressedSize()