[WebLayer] Fix crash when showing blocked permission interaction dialog

WebLayer wraps the Activity in a ContextWrapper that allows accessing
chromium resources. When accessing resources that context needs to be
used instead of the activity.

Bug: 1111109
Change-Id: Id2e465264e5dc90591d4a1a8c74b7e786aeba512
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2327958
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Auto-Submit: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793197}

components/permissions/android/java/src/org/chromium/components/permissions/PermissionDialogController.java

@@ -5,7 +5,6 @@
 package org.chromium.components.permissions;
 
 import android.annotation.SuppressLint;
-import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Build;
@@ -15,6 +14,7 @@ import androidx.annotation.IntDef;
 import androidx.annotation.VisibleForTesting;
 
 import org.chromium.base.BuildInfo;
+import org.chromium.base.ContextUtils;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.ui.modaldialog.DialogDismissalCause;
 import org.chromium.ui.modaldialog.ModalDialogManager;
@@ -144,12 +144,14 @@ public class PermissionDialogController
         assert mState == State.NOT_SHOWING;
 
         mDialogDelegate = mRequestQueue.remove(0);
-        Activity activity = mDialogDelegate.getWindow().getActivity().get();
+        // Use the context to access resources instead of the activity because the activity may not
+        // have the correct resources in some cases (e.g. WebLayer).
+        Context context = mDialogDelegate.getWindow().getContext().get();
 
         // It's possible for the activity to be null if we reach here just after the user
         // backgrounds the browser and cleanup has happened. In that case, we can't show a prompt,
         // so act as though the user dismissed it.
-        if (activity == null) {
+        if (ContextUtils.activityFromContext(context) == null) {
             // TODO(timloh): This probably doesn't work, as this happens synchronously when creating
             // the PermissionPromptAndroid, so the PermissionRequestManager won't be ready yet.
             mDialogDelegate.onDismiss();
@@ -167,7 +169,7 @@ public class PermissionDialogController
         mModalDialogManager = mDialogDelegate.getWindow().getModalDialogManager();
 
         mDialogModel = PermissionDialogModel.getModel(
-                this, mDialogDelegate, () -> showFilteredTouchEventDialog(activity));
+                this, mDialogDelegate, () -> showFilteredTouchEventDialog(context));
         mModalDialogManager.showDialog(mDialogModel, ModalDialogManager.ModalDialogType.TAB);
         mState = State.PROMPT_OPEN;
     }