[Android] PhotoPicker: Add Roboelectric test for PickerBitmapview.

Bug: 1006823, 656015
Change-Id: I47875b25a542ba6040eda7147449c7fb61d89024
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132218
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Theresa  <twellington@chromium.org>
Auto-Submit: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755469}

chrome/android/chrome_junit_test_java_sources.gni

@@ -180,6 +180,7 @@ chrome_junit_test_java_sources = [
   "junit/src/org/chromium/chrome/browser/password_manager/settings/TimedCallbackDelayerTest.java",
   "junit/src/org/chromium/chrome/browser/payments/AutofillContactTest.java",
   "junit/src/org/chromium/chrome/browser/payments/AutofillContactUnitTest.java",
+  "junit/src/org/chromium/chrome/browser/photo_picker/PickerBitmapViewTest.java",
   "junit/src/org/chromium/chrome/browser/preferences/PrefServiceBridgeTest.java",
   "junit/src/org/chromium/chrome/browser/privacy/settings/PrivacyPreferencesManagerTest.java",
   "junit/src/org/chromium/chrome/browser/search_engines/SearchEngineChoiceMetricsTest.java",

chrome/android/junit/src/org/chromium/chrome/browser/photo_picker/PickerBitmapViewTest.java

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.photo_picker;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+import org.chromium.base.test.BaseRobolectricTestRunner;
+
+import java.util.Collections;
+
+/**
+ * junit tests for the {@link PickerBitmapView} class.
+ */
+@RunWith(BaseRobolectricTestRunner.class)
+@Config(manifest = Config.NONE)
+public class PickerBitmapViewTest {
+    @Test
+    public void testPrematureOnSelectionStateChanged() {
+        PickerBitmapView view =
+                new PickerBitmapView(RuntimeEnvironment.application.getApplicationContext(), null);
+        // Simulate crash scenario in crbug.com/1006823, where an event occurred before
+        // PickerBitmapView has been initialized.
+        view.onSelectionStateChange(Collections.emptyList());
+    }
+}