Android: Add some debugging to r8 to diagnose race condition

Bug: 1153249
Change-Id: Ia6ef721da2839d67a99ad67c41fe7c2a11a555c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2581302
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Sam Maier <smaier@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835280}

DEPS

@@ -1415,7 +1415,7 @@ deps = {
       'packages': [
           {
               'package': 'chromium/third_party/r8',
-              'version': 'GXNupZ4wd3_EsDohjcNOss3iuVb5gcv0rAeHUiH05JkC',
+              'version': 'DR3nwJggFDcmTDz7P8fJQCtRLO1nxDt26czkOqhtZJ8C',
           },
       ],
       'condition': 'checkout_android',

third_party/r8/README.chromium

@@ -20,6 +20,7 @@ R8 is a proguard-like optimizer that also has the ability to dex.
 
 Local Modifications:
 * Refer to commit descriptions within "patches" directory.
+  * Plus: https://r8-review.googlesource.com/c/r8/+/56708
 * Added "playground" directory for quick "how does this optimize" tests.
 * Removed references to ConcurrentHashMap in desugar_jdk_libs.json.