Add missing includes in animation controller

Include What You Use is reporting some missing includes. This CL adds
those missing includes.

Change-Id: Iff9a529d337db16c8c104a78c2ea32b456777884
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2408721
Commit-Queue: Chris Blume <cblume@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806947}

cc/trees/image_animation_controller.cc

@@ -4,6 +4,7 @@
 
 #include "cc/trees/image_animation_controller.h"
 
+#include <algorithm>
 #include <sstream>
 
 #include "base/bind.h"

cc/trees/image_animation_controller.h

@@ -5,6 +5,9 @@
 #ifndef CC_TREES_IMAGE_ANIMATION_CONTROLLER_H_
 #define CC_TREES_IMAGE_ANIMATION_CONTROLLER_H_
 
+#include <string>
+#include <vector>
+
 #include "base/cancelable_callback.h"
 #include "base/containers/flat_map.h"
 #include "base/containers/flat_set.h"