Reorder DownloadManager methods into a more natural order

- Start before stop
- Release near bottom
- Private after public

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=195570480

library/core/src/main/java/com/google/android/exoplayer2/offline/DownloadManager.java

@@ -179,39 +179,21 @@ public final class DownloadManager {
   }
   }
 
 
   /**
   /**
-   * Stops all of the tasks and releases resources. If the action file isn't up to date, waits for
-   * the changes to be written. The manager must not be accessed after this method has been called.
+   * Adds a {@link Listener}.
+   *
+   * @param listener The listener to be added.
    */
    */
-  public void release() {
-    if (released) {
-      return;
-    }
-    released = true;
-    for (int i = 0; i < tasks.size(); i++) {
-      tasks.get(i).stop();
-    }
-    final ConditionVariable fileIOFinishedCondition = new ConditionVariable();
-    fileIOHandler.post(new Runnable() {
-      @Override
-      public void run() {
-        fileIOFinishedCondition.open();
-      }
-    });
-    fileIOFinishedCondition.block();
-    fileIOThread.quit();
-    logd("Released");
+  public void addListener(Listener listener) {
+    listeners.add(listener);
   }
   }
 
 
-  /** Stops all of the download tasks. Call {@link #startDownloads()} to restart tasks. */
-  public void stopDownloads() {
-    Assertions.checkState(!released);
-    if (!downloadsStopped) {
-      downloadsStopped = true;
-      for (int i = 0; i < activeDownloadTasks.size(); i++) {
-        activeDownloadTasks.get(i).stop();
-      }
-      logd("Downloads are stopping");
-    }
+  /**
+   * Removes a {@link Listener}.
+   *
+   * @param listener The listener to be removed.
+   */
+  public void removeListener(Listener listener) {
+    listeners.remove(listener);
   }
   }
 
 
   /** Starts the download tasks. */
   /** Starts the download tasks. */
@@ -224,22 +206,16 @@ public final class DownloadManager {
     }
     }
   }
   }
 
 
-  /**
-   * Adds a {@link Listener}.
-   *
-   * @param listener The listener to be added.
-   */
-  public void addListener(Listener listener) {
-    listeners.add(listener);
+  /** Stops all of the download tasks. Call {@link #startDownloads()} to restart tasks. */
+  public void stopDownloads() {
+    Assertions.checkState(!released);
+    if (!downloadsStopped) {
+      downloadsStopped = true;
+      for (int i = 0; i < activeDownloadTasks.size(); i++) {
+        activeDownloadTasks.get(i).stop();
+      }
+      logd("Downloads are stopping");
     }
     }
-
-  /**
-   * Removes a {@link Listener}.
-   *
-   * @param listener The listener to be removed.
-   */
-  public void removeListener(Listener listener) {
-    listeners.remove(listener);
   }
   }
 
 
   /**
   /**
@@ -275,13 +251,6 @@ public final class DownloadManager {
     return task.id;
     return task.id;
   }
   }
 
 
-  private Task addTaskForAction(DownloadAction action) {
-    Task task = new Task(nextTaskId++, this, action, minRetryCount);
-    tasks.add(task);
-    logd("Task is added", task);
-    return task;
-  }
-
   /** Returns the current number of tasks. */
   /** Returns the current number of tasks. */
   public int getTaskCount() {
   public int getTaskCount() {
     Assertions.checkState(!released);
     Assertions.checkState(!released);
@@ -325,6 +294,37 @@ public final class DownloadManager {
   }
   }
 
 
   /**
   /**
+   * Stops all of the tasks and releases resources. If the action file isn't up to date, waits for
+   * the changes to be written. The manager must not be accessed after this method has been called.
+   */
+  public void release() {
+    if (released) {
+      return;
+    }
+    released = true;
+    for (int i = 0; i < tasks.size(); i++) {
+      tasks.get(i).stop();
+    }
+    final ConditionVariable fileIOFinishedCondition = new ConditionVariable();
+    fileIOHandler.post(new Runnable() {
+      @Override
+      public void run() {
+        fileIOFinishedCondition.open();
+      }
+    });
+    fileIOFinishedCondition.block();
+    fileIOThread.quit();
+    logd("Released");
+  }
+
+  private Task addTaskForAction(DownloadAction action) {
+    Task task = new Task(nextTaskId++, this, action, minRetryCount);
+    tasks.add(task);
+    logd("Task is added", task);
+    return task;
+  }
+
+  /**
    * Iterates through the task queue and starts any task if all of the following are true:
    * Iterates through the task queue and starts any task if all of the following are true:
    *
    *
    * <ul>
    * <ul>