[FileEncap9] Extract ResearchLogDirectory class

Previously used a monotonically increasing int.  Now uses uuid and nanoseconds.

squashed in:
    [FileEncap11] Read preference from ResearchSettings
    Change-Id: Ic779e0a69db6b16e92c6f4b63dbe7b7add566ab6

    [FileEncap12] Simplify directory cleanup invocation
    Change-Id: I688047409c0343d32b11447fb625dfb726c731ec

    [FileEncap14] Change log filename syntax
    Change-Id: I9243b20b2eb392f81ab8c5c3d19315211240e0bc

Change-Id: I5c9d70e0cb7b0965158e17dd71dfab796bd9a440

1 files changed, 2 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/research/ResearchLog.java b/java/src/com/android/inputmethod/research/ResearchLog.java
index f7c5fd50e..080366e9b 100644
--- a/java/src/com/android/inputmethod/research/ResearchLog.java
+++ b/java/src/com/android/inputmethod/research/ResearchLog.java
@@ -118,6 +118,8 @@ public class ResearchLog {
                 } catch (Exception e) {
                     Log.d(TAG, "error when closing ResearchLog:", e);
                 } finally {
+                    // Marking the file as read-only signals that this log file is ready to be
+                    // uploaded.
                     if (mFile != null && mFile.exists()) {
                         mFile.setWritable(false, false);
                     }