[Crash Reporting] Fix a race between uploading and appending logcat data.

components/minidump_uploader/android/java/src/org/chromium/components/minidump_uploader/MinidumpUploaderDelegate.java

Index: components/minidump_uploader/android/java/src/org/chromium/components/minidump_uploader/MinidumpUploaderDelegate.java
diff --git a/components/minidump_uploader/android/java/src/org/chromium/components/minidump_uploader/MinidumpUploaderDelegate.java b/components/minidump_uploader/android/java/src/org/chromium/components/minidump_uploader/MinidumpUploaderDelegate.java
index bd3e72764b0c1c6e83f36c6d3d2d86f38762d54b..8dacd4e4cd90b0b5687baf20426a3f0b196866b7 100644
--- a/components/minidump_uploader/android/java/src/org/chromium/components/minidump_uploader/MinidumpUploaderDelegate.java
+++ b/components/minidump_uploader/android/java/src/org/chromium/components/minidump_uploader/MinidumpUploaderDelegate.java
@@ -46,4 +46,17 @@ public interface MinidumpUploaderDelegate {
      * @param minidump The minidump filename, prior to the upload attempt.
      */
     void recordUploadFailure(File minidump);
+
+    /**
+     * Prior to M60, the ".tryN" suffix was optional for files ready to be uploaded; it is now
+     * required. Clients may implement this method to migrate previously saved minidumps to the new
+     * naming scheme, if necessary.
+     * Note: Because renaming files is a file operation, this method should never be called on the
+     * UI thread; only on a background thread.
+     * @param crashfileManager The file manager responsible for the set of minidumps that might need
+     *     migration.
+     * TODO(isherman): This is temporary migration logic, and can be removed in M61:
+     * http://crbug.com/719120.
+     */
+    void migrateMinidumpFilenamesIfNeeded(CrashFileManager crashFileManager);
 }