Animate depth from the right value on Taskbar All Apps launches.

`MyDepthController` in `QuickstepTransitionLauncher` assumes that we
want the background to always animate the same way, matching the rest
state of the workspace (depth == 0). However, in Taskbar All Apps the
background is visible, and depth != 0. We now initialize the one-off
`DepthController` for launches to take into account the latest depth set
by the top level `DepthController`, so there is no jumpcut at the
beginning of the animation.

Note that in my opinion we should use the same `DepthController` for all
cases, rather than having this one-off. I'm looking into the feasibility
of that change, but for now this fixes the issue at hand.

Fix: 292959100
Flag: N/A
Test: manual, see videos in the bug

(cherry picked from commit 627d67549f73c4c456537f814e450fa8a1318937)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:3e91646d123abbe58ccc0544746145ce5024b923)
Merged-In: Id90e8e728cc3e2ccf7d92148fbb0d6ff3e6fd6ca
Change-Id: Id90e8e728cc3e2ccf7d92148fbb0d6ff3e6fd6ca
diff --git a/quickstep/src/com/android/launcher3/QuickstepTransitionManager.java b/quickstep/src/com/android/launcher3/QuickstepTransitionManager.java
index ca9c577..75f25ac 100644
--- a/quickstep/src/com/android/launcher3/QuickstepTransitionManager.java
+++ b/quickstep/src/com/android/launcher3/QuickstepTransitionManager.java
@@ -1046,7 +1046,7 @@
         boolean allowBlurringLauncher = mLauncher.getStateManager().getState() != OVERVIEW
                 && BlurUtils.supportsBlursOnWindows();
 
-        MyDepthController depthController = new MyDepthController(mLauncher);
+        LaunchDepthController depthController = new LaunchDepthController(mLauncher);
         ObjectAnimator backgroundRadiusAnim = ObjectAnimator.ofFloat(depthController.stateDepth,
                         MULTI_PROPERTY_VALUE, BACKGROUND_APP.getDepth(mLauncher))
                 .setDuration(APP_LAUNCH_DURATION);
@@ -2047,11 +2047,14 @@
         }
     }
 
-    private static class MyDepthController extends DepthController {
-        MyDepthController(Launcher l) {
-            super(l);
+    private static class LaunchDepthController extends DepthController {
+        LaunchDepthController(QuickstepLauncher launcher) {
+            super(launcher);
             setCrossWindowBlursEnabled(
                     CrossWindowBlurListeners.getInstance().isCrossWindowBlurEnabled());
+            // Make sure that the starting value matches the current depth set by the main
+            // controller.
+            stateDepth.setValue(launcher.getDepthController().stateDepth.getValue());
         }
     }
 }