Readability improvements in Logging

We now truncate Session method paths and IDs based on the Logging level
to improve Session Logging readability in logcat. If another external
session is started off of an existing external Session, the preceding
histories are replaced with "..." so that the Session information is not
overwhelming.

Bug: 26571395
Test: Unit Tests and manual tests pass
Change-Id: I9ffda3d64f1072fa6228a82a86116a5e47d18c96
diff --git a/telecomm/java/android/telecom/Logging/Runnable.java b/telecomm/java/android/telecom/Logging/Runnable.java
index 56c52bf..6e81053 100644
--- a/telecomm/java/android/telecom/Logging/Runnable.java
+++ b/telecomm/java/android/telecom/Logging/Runnable.java
@@ -27,7 +27,7 @@
 
     private Session mSubsession;
     private final String mSubsessionName;
-    private final Object mLock = new Object();
+    private final Object mLock;
     private final java.lang.Runnable mRunnable = new java.lang.Runnable() {
         @Override
         public void run() {
@@ -45,7 +45,18 @@
         }
     };
 
-    public Runnable(String subsessionName) {
+    /**
+     * Creates a new Telecom Runnable that incorporates Session Logging into it. Useful for carrying
+     * Logging Sessions through different threads as well as through handlers.
+     * @param subsessionName The name that will be used in the Logs to mark this Session
+     * @param lock The synchronization lock that will be used to lock loggedRun().
+     */
+    public Runnable(String subsessionName, Object lock) {
+        if (lock == null) {
+            mLock = new Object();
+        } else {
+            mLock = lock;
+        }
         mSubsessionName = subsessionName;
     }
 
@@ -85,4 +96,4 @@
      */
     abstract public void loggedRun();
 
-}
+}
\ No newline at end of file