cros: Do not play animations for non-focused users.

Bug: 872923
Change-Id: I7071921895fcd017a65286fce4b565ad8f96de76
Reviewed-on: https://chromium-review.googlesource.com/1170035
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Xiaoyin Hu <xiaoyinh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582245}

ash/login/ui/animated_rounded_image_view.h

@@ -24,7 +24,7 @@ class AnimatedRoundedImageView : public views::View {
   enum class Playback {
     kFirstFrameOnly,  // Only the first frame in the animation will be shown.
     kSingle,          // Play the animation only once.
-    kRepeat,          // Play the animation repeatly.
+    kRepeat,          // Play the animation repeatedly.
   };
 
   // Provides animation frames.
@@ -49,6 +49,9 @@ class AnimatedRoundedImageView : public views::View {
   // Set playback type of the animation.
   void SetAnimationPlayback(Playback playback);
 
+  // Get the current type of animation playback.
+  Playback playback() const { return playback_; }
+
   // views::View:
   gfx::Size CalculatePreferredSize() const override;
   void OnPaint(gfx::Canvas* canvas) override;

ash/login/ui/login_user_view.cc

@@ -153,9 +153,10 @@ class LoginUserView::UserImage : public NonAccessibleView {
       return;
     }
 
+    // Don't change the playback style which was set in SetAnimationEnabled.
     image_->SetAnimationDecoder(
         std::make_unique<PassthroughAnimationDecoder>(animation),
-        AnimatedRoundedImageView::Playback::kRepeat);
+        image_->playback());
   }
 
   AnimatedRoundedImageView* image_ = nullptr;