Avoid loading action icons when possible

This is a similar memory optimization as applied to the app icon in
ag/12727673.

Bug: 160591450
Test: manual - heap_profile sysui while toggling play/pause.
Change-Id: I66fee5b8cb6b2abdbb7dadda09ccd1d4905c5706

packages/SystemUI/src/com/android/systemui/media/MediaControlPanel.java

@@ -329,7 +329,7 @@ public class MediaControlPanel {
             int actionId = ACTION_IDS[i];
             final ImageButton button = mViewHolder.getAction(actionId);
             MediaAction mediaAction = actionIcons.get(i);
-            button.setImageDrawable(mediaAction.getDrawable());
+            button.setImageIcon(mediaAction.getIcon());
             button.setContentDescription(mediaAction.getContentDescription());
             Runnable action = mediaAction.getAction();
 

packages/SystemUI/src/com/android/systemui/media/MediaData.kt

@@ -109,7 +109,7 @@ data class MediaData(
 
 /** State of a media action. */
 data class MediaAction(
-    val drawable: Drawable?,
+    val icon: Icon?,
     val action: Runnable?,
     val contentDescription: CharSequence?
 )

packages/SystemUI/src/com/android/systemui/media/MediaDataManager.kt

@@ -501,8 +501,13 @@ class MediaDataManager(
                 } else {
                     null
                 }
+                val mediaActionIcon = if (action.getIcon()?.getType() == Icon.TYPE_RESOURCE) {
+                    Icon.createWithResource(packageContext, action.getIcon()!!.getResId())
+                } else {
+                    action.getIcon()
+                }
                 val mediaAction = MediaAction(
-                        action.getIcon().loadDrawable(packageContext),
+                        mediaActionIcon,
                         runnable,
                         action.title)
                 actionIcons.add(mediaAction)
@@ -612,7 +617,7 @@ class MediaDataManager(
 
     private fun getResumeMediaAction(action: Runnable): MediaAction {
         return MediaAction(
-            context.getDrawable(R.drawable.lb_ic_play),
+            Icon.createWithResource(context, R.drawable.lb_ic_play),
             action,
             context.getString(R.string.controls_media_resume)
         )