Reland "android: Add LifetimeAssert to WindowAndroid"

This is a reland of 9d2c67b2
Landed changes to relax LifetimeAssert when DestroyActivitiesRule
fails. See bug for details.

Original change's description:
> android: Add LifetimeAssert to WindowAndroid
>
> Bug: 1081250
> Change-Id: Id0924545fbdb1eb28ae3c8fe015559fd3e9c53d1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2191785
> Commit-Queue: Bo <boliu@chromium.org>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#771220}

Bug: 1081250
Change-Id: Iea2dd27c5b114d748c6f0de8edf17c68b3ec98de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216798Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772259}

ui/android/java/src/org/chromium/ui/base/WindowAndroid.java

@@ -34,6 +34,7 @@ import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.BuildInfo;
 import org.chromium.base.Callback;
 import org.chromium.base.ContextUtils;
+import org.chromium.base.LifetimeAssert;
 import org.chromium.base.Log;
 import org.chromium.base.ObserverList;
 import org.chromium.base.PackageManagerUtils;
@@ -68,6 +69,8 @@ public class WindowAndroid implements AndroidPermissionDelegate, DisplayAndroidO
     // exactly match the target rate.
     private static final float MAX_REFRESH_RATE_DELTA = 2.f;
 
+    private final LifetimeAssert mLifetimeAssert;
+
     private KeyboardVisibilityDelegate mKeyboardVisibilityDelegate =
             KeyboardVisibilityDelegate.getInstance();
 
@@ -204,6 +207,7 @@ public class WindowAndroid implements AndroidPermissionDelegate, DisplayAndroidO
      */
     @SuppressLint("UseSparseArrays")
     protected WindowAndroid(Context context, DisplayAndroid display) {
+        mLifetimeAssert = LifetimeAssert.create(this);
         // context does not have the same lifetime guarantees as an application context so we can't
         // hold a strong reference to it.
         mContextRef = new ImmutableWeakReference<>(context);
@@ -628,6 +632,7 @@ public class WindowAndroid implements AndroidPermissionDelegate, DisplayAndroidO
      * Destroys the c++ WindowAndroid object if one has been created.
      */
     public void destroy() {
+        LifetimeAssert.setSafeToGc(mLifetimeAssert, true);
         if (mNativeWindowAndroid != 0) {
             // Native code clears |mNativeWindowAndroid|.
             WindowAndroidJni.get().destroy(mNativeWindowAndroid, WindowAndroid.this);