Bug 818021 - Use fade out transition when leaving awesome screen (r=mfinkle)

mobile/android/base/AwesomeBar.java

@@ -364,13 +364,13 @@ public class AwesomeBar extends GeckoActivity {
     private void cancelAndFinish() {
         setResult(Activity.RESULT_CANCELED);
         finish();
-        overridePendingTransition(0, 0);
+        overridePendingTransition(R.anim.awesomebar_hold_still, R.anim.awesomebar_fade_out);
     }
 
     private void finishWithResult(Intent intent) {
         setResult(Activity.RESULT_OK, intent);
         finish();
-        overridePendingTransition(0, 0);
+        overridePendingTransition(R.anim.awesomebar_hold_still, R.anim.awesomebar_fade_out);
     }
 
     private void openUrlAndFinish(String url) {

mobile/android/base/Makefile.in

@@ -486,6 +486,7 @@ RES_XML = \
 
 RES_ANIM = \
   res/anim/awesomebar_fade_in.xml \
+  res/anim/awesomebar_fade_out.xml \
   res/anim/awesomebar_hold_still.xml \
   res/anim/grow_fade_in.xml \
   res/anim/grow_fade_in_center.xml \

mobile/android/base/resources/anim/awesomebar_fade_out.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <alpha android:interpolator="@android:anim/accelerate_interpolator"
+           android:fromAlpha="1.0"
+           android:toAlpha="0.0"
+           android:duration="200"/>
+
+</set>