Switch on android.telecom.Log in Telecom

Move over the Runnable Class into android.telecom and turn on the
framework's usage in Telecom.
CP from: https://android-review.googlesource.com/#/c/287291/

Test: All Telecom unit tests pass. Manual Log testing has also been
confirmed to be working as it did before.
Bug: 26571395
Change-Id: If7e2036c746c5a953f3a77e2d625a423ce5bf8f3

telecomm/java/android/telecom/Log.java

@@ -16,6 +16,7 @@
 
 package android.telecom;
 
+import android.content.Context;
 import android.net.Uri;
 import android.os.AsyncTask;
 import android.telecom.Logging.EventManager;
@@ -175,6 +176,10 @@ public class Log {
      * loggers.
      */
 
+    public static void setSessionContext(Context context) {
+        getSessionManager().setContext(context);
+    }
+
     public static void startSession(String shortMethodName) {
         getSessionManager().startSession(shortMethodName, null);
     }
@@ -300,7 +305,7 @@ public class Log {
 
     private static MessageDigest sMessageDigest;
 
-    static void initMd5Sum() {
+    public static void initMd5Sum() {
         new AsyncTask<Void, Void, Void>() {
             @Override
             public Void doInBackground(Void... args) {
@@ -426,7 +431,7 @@ public class Log {
             msg = (args == null || args.length == 0) ? format
                     : String.format(Locale.US, format, args);
         } catch (IllegalFormatException ife) {
-            e("Log", ife, "IllegalFormatException: formatString='%s' numArgs=%d", format,
+            e(TAG, ife, "Log: IllegalFormatException: formatString='%s' numArgs=%d", format,
                     args.length);
             msg = format + " (An error occurred while formatting the message.)";
         }

telecomm/java/android/telecom/Logging/EventManager.java

@@ -291,7 +291,7 @@ public class EventManager {
             msg = (args == null || args.length == 0) ? format
                     : String.format(Locale.US, format, args);
         } catch (IllegalFormatException ife) {
-            Log.e("Log", ife, "IllegalFormatException: formatString='%s' numArgs=%d", format,
+            Log.e(this, ife, "IllegalFormatException: formatString='%s' numArgs=%d", format,
                     args.length);
             msg = format + " (An error occurred while formatting the message.)";
         }

telecomm/java/android/telecom/Logging/Runnable.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package android.telecom.Logging;
+
+import android.telecom.Log;
+
+/**
+ * Encapsulates session logging in a Runnable to reduce code duplication when continuing subsessions
+ * in a handler/thread.
+ * @hide
+ */
+public abstract class Runnable {
+
+    private Session mSubsession;
+    private final String mSubsessionName;
+    private final Object mLock;
+    private final java.lang.Runnable mRunnable = new java.lang.Runnable() {
+        @Override
+        public void run() {
+            synchronized (mLock) {
+                try {
+                    Log.continueSession(mSubsession, mSubsessionName);
+                    loggedRun();
+                } finally {
+                    if (mSubsession != null) {
+                        Log.endSession();
+                        mSubsession = null;
+                    }
+                }
+            }
+        }
+    };
+
+    /**
+     * 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;
+    }
+
+    /**
+     * Return the runnable that will be canceled in the handler queue.
+     * @return Runnable object to cancel.
+     */
+    public final java.lang.Runnable getRunnableToCancel() {
+        return mRunnable;
+    }
+
+    /**
+     * Creates a Runnable and a logging subsession that can be used in a handler/thread. Be sure to
+     * call cancel() if this session is never going to be run (removed from a handler queue, for
+     * for example).
+     * @return A Java Runnable that can be used in a handler queue or thread.
+     */
+    public java.lang.Runnable prepare() {
+        cancel();
+        mSubsession = Log.createSubsession();
+        return mRunnable;
+    }
+
+    /**
+     * This method is used to clean up the active session if the Runnable gets removed from a
+     * handler and is never run.
+     */
+    public void cancel() {
+        synchronized (mLock) {
+            Log.cancelSubsession(mSubsession);
+            mSubsession = null;
+        }
+    }
+
+    /**
+     * The method that will be run in the handler/thread.
+     */
+    abstract public void loggedRun();
+
+}