Make FragmentController$findFragmentByWho public

Change the access modifier of the findFragmentByWho method in the
FragmentController class from package-private to public.

Bug: 29499599
Change-Id: Id42a8133a0ab9b9efbbef447c852e418109916d8
diff --git a/api/current.txt b/api/current.txt
index 7dc5ab7..d2b33d2 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -3921,6 +3921,7 @@
     method public void doLoaderStop(boolean);
     method public void dumpLoaders(java.lang.String, java.io.FileDescriptor, java.io.PrintWriter, java.lang.String[]);
     method public boolean execPendingActions();
+    method public android.support.v4.app.Fragment findFragmentByWho(java.lang.String);
     method public java.util.List<android.support.v4.app.Fragment> getActiveFragments(java.util.List<android.support.v4.app.Fragment>);
     method public int getActiveFragmentsCount();
     method public android.support.v4.app.FragmentManager getSupportFragmentManager();
diff --git a/fragment/java/android/support/v4/app/FragmentController.java b/fragment/java/android/support/v4/app/FragmentController.java
index 5e2f955..7894437 100644
--- a/fragment/java/android/support/v4/app/FragmentController.java
+++ b/fragment/java/android/support/v4/app/FragmentController.java
@@ -70,12 +70,12 @@
      * Returns a fragment with the given identifier.
      */
     @Nullable
-    Fragment findFragmentByWho(String who) {
+    public Fragment findFragmentByWho(String who) {
         return mHost.mFragmentManager.findFragmentByWho(who);
     }
 
     /**
-     * Returns the number of active fragments. 
+     * Returns the number of active fragments.
      */
     public int getActiveFragmentsCount() {
         final List<Fragment> actives = mHost.mFragmentManager.mActive;