Fix jank in swipe-up to unlock

Some stuff is slow in the swipe-up to unlock transition. Introduce
DejankUtils to execute it when RenderThread is doing its work.

Bug: 22205322
Change-Id: I7089f0a1bdca13ad13a1e305a7bff32276a3cd53

packages/SystemUI/src/com/android/systemui/DejankUtils.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.systemui;
+
+import android.os.Handler;
+import android.os.Looper;
+import android.os.StrictMode;
+import android.view.Choreographer;
+
+import java.util.ArrayList;
+
+/**
+ * Utility class for methods used to dejank the UI.
+ */
+public class DejankUtils {
+
+    private static final Choreographer sChoreographer = Choreographer.getInstance();
+    private static final Handler sHandler = new Handler();
+
+    private static final ArrayList<Runnable> sPendingRunnables = new ArrayList<>();
+
+    private static final Runnable sAnimationCallbackRunnable = new Runnable() {
+        @Override
+        public void run() {
+            for (int i = 0; i < sPendingRunnables.size(); i++) {
+                sHandler.post(sPendingRunnables.get(i));
+            }
+            sPendingRunnables.clear();
+        }
+    };
+
+    /**
+     * Executes {@code r} after performTraversals. Use this do to CPU heavy work for which the
+     * timing is not critical for animation. The work is then scheduled at the same time
+     * RenderThread is doing its thing, leading to better parallelization.
+     *
+     * <p>Needs to be called from the main thread.
+     */
+    public static void postAfterTraversal(Runnable r) {
+        throwIfNotCalledOnMainThread();
+        sPendingRunnables.add(r);
+        postAnimationCallback();
+    }
+
+    /**
+     * Removes a previously scheduled runnable.
+     *
+     * <p>Needs to be called from the main thread.
+     */
+    public static void removeCallbacks(Runnable r) {
+        throwIfNotCalledOnMainThread();
+        sPendingRunnables.remove(r);
+        sHandler.removeCallbacks(r);
+    }
+
+    private static void postAnimationCallback() {
+        sChoreographer.postCallback(Choreographer.CALLBACK_ANIMATION, sAnimationCallbackRunnable,
+                null);
+    }
+
+    private static void throwIfNotCalledOnMainThread() {
+        if (!Looper.getMainLooper().isCurrentThread()) {
+            throw new IllegalStateException("should be called from the main thread.");
+        }
+    }
+}

packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardBouncer.java

@@ -29,6 +29,7 @@ import com.android.keyguard.KeyguardHostView;
 import com.android.keyguard.KeyguardSecurityView;
 import com.android.keyguard.R;
 import com.android.keyguard.ViewMediatorCallback;
+import com.android.systemui.DejankUtils;
 
 import static com.android.keyguard.KeyguardHostView.OnDismissAction;
 import static com.android.keyguard.KeyguardSecurityModel.SecurityMode;
@@ -46,7 +47,6 @@ public class KeyguardBouncer {
     private KeyguardHostView mKeyguardView;
     private ViewGroup mRoot;
     private boolean mShowingSoon;
-    private Choreographer mChoreographer = Choreographer.getInstance();
     private int mBouncerPromptReason;
 
     public KeyguardBouncer(Context context, ViewMediatorCallback callback,
@@ -70,16 +70,13 @@ public class KeyguardBouncer {
             return;
         }
 
-        mBouncerPromptReason = mCallback.getBouncerPromptReason();
-
         // Try to dismiss the Keyguard. If no security pattern is set, this will dismiss the whole
         // Keyguard. If we need to authenticate, show the bouncer.
         if (!mKeyguardView.dismiss()) {
             mShowingSoon = true;
 
             // Split up the work over multiple frames.
-            mChoreographer.postCallbackDelayed(Choreographer.CALLBACK_ANIMATION, mShowRunnable,
-                    null, 16);
+            DejankUtils.postAfterTraversal(mShowRunnable);
         }
     }
 
@@ -107,7 +104,7 @@ public class KeyguardBouncer {
     }
 
     private void cancelShowRunnable() {
-        mChoreographer.removeCallbacks(Choreographer.CALLBACK_ANIMATION, mShowRunnable, null);
+        DejankUtils.removeCallbacks(mShowRunnable);
         mShowingSoon = false;
     }
 
@@ -165,6 +162,7 @@ public class KeyguardBouncer {
         if (wasInitialized) {
             mKeyguardView.showPrimarySecurityScreen();
         }
+        mBouncerPromptReason = mCallback.getBouncerPromptReason();
     }
 
     private void ensureView() {

packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarView.java

@@ -24,6 +24,7 @@ import android.view.MotionEvent;
 import android.view.View;
 import android.view.accessibility.AccessibilityEvent;
 
+import com.android.systemui.DejankUtils;
 import com.android.systemui.EventLogTags;
 import com.android.systemui.R;
 
@@ -117,12 +118,12 @@ public class PhoneStatusBarView extends PanelBar {
     public void onAllPanelsCollapsed() {
         super.onAllPanelsCollapsed();
         // Close the status bar in the next frame so we can show the end of the animation.
-        postOnAnimation(mHideExpandedRunnable);
+        DejankUtils.postAfterTraversal(mHideExpandedRunnable);
         mLastFullyOpenedPanel = null;
     }
 
     public void removePendingHideExpandedRunnables() {
-        removeCallbacks(mHideExpandedRunnable);
+        DejankUtils.removeCallbacks(mHideExpandedRunnable);
     }
 
     @Override