Update changelog and bump versions for v2.5.3

Change-Id: I49b3ac8ae1ded909f3324a9089416357cdc46c63

CHANGELOG.md

@@ -1,3 +1,39 @@
+## 2.5.3 (2019-07-03)
+
+Bugfixes:
+  - Fix DASH bug when ignoring minBufferTime
+    - https://github.com/google/shaka-player/issues/2015
+  - Avoid changing variant when switching text lang
+    - https://github.com/google/shaka-player/issues/2010
+  - Work around platform bug when seeking to end
+    - https://github.com/google/shaka-player/issues/1967
+  - Allow apps to extend shaka.ui.Element
+    - https://github.com/google/shaka-player/issues/2011
+  - Fix bug when adding text streams while not streaming text
+    - https://github.com/google/shaka-player/issues/1938
+  - Fix edge case when switching text in multi-Period content
+    - https://github.com/google/shaka-player/issues/1774
+  - Fix playback rate bug on IE11
+  - Make fast forwarding work when video is paused
+    - https://github.com/google/shaka-player/issues/1801
+  - Fix stack overflow in StringUtils on some platforms
+    - https://github.com/google/shaka-player/issues/1985
+    - https://github.com/google/shaka-player/issues/1994
+  - Fix reading customData from standard Cast LOAD message
+    - https://github.com/google/shaka-player/issues/1989
+
+Docs:
+  - Fix constant name in UI tutorials
+    - https://github.com/google/shaka-player/issues/2005
+  - Update build output name in docs
+    - https://github.com/google/shaka-player/issues/1929
+
+New Features:
+  - Use trick play for fast forward when browser doesn't support high
+    playbackRate
+    - https://github.com/google/shaka-player/issues/1957
+
+
 ## 2.5.2 (2019-06-10)
 
 Bugfixes:

lib/player.js

@@ -5305,7 +5305,7 @@ shaka.Player.TYPICAL_BUFFERING_THRESHOLD_ = 0.5;
  * @define {string} A version number taken from git at compile time.
  * @export
  */
-shaka.Player.version = 'v2.5.2-master-uncompiled';
+shaka.Player.version = 'v2.5.3-master-uncompiled';
 
 // Initialize the deprecation system using the version string we just set
 // on the player.