android: adding helpers in CloseableOnMainThread for setting strictmode on main thread

Also fixing the remaining copy related testing that are failing due to
strict mode

Bug: 1046062
Change-Id: I5a07db2b9ee16fb50094a968eab80f34d9b5addd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028928Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#738663}

base/test/android/javatests/src/org/chromium/base/test/util/CloseableOnMainThread.java

@@ -6,6 +6,8 @@ package org.chromium.base.test.util;
 
 import android.support.test.InstrumentationRegistry;
 
+import org.chromium.base.StrictModeContext;
+
 import java.io.Closeable;
 import java.io.IOException;
 import java.util.concurrent.Callable;
@@ -57,4 +59,40 @@ public final class CloseableOnMainThread implements Closeable {
             throw new IOException(mException.getCause());
         }
     }
+
+    /**
+     * Enables try-with-resources compatible StrictMode violation whitelisting on android's main
+     * thread.
+     *
+     * Prefer "ignored" as the variable name to appease Android Studio's "Unused symbol" inspection.
+     *
+     * Example:
+     * <pre>
+     *     try (CloseableOnMainThread ignored =
+     *                     CloseableOnMainThread.StrictMode.allowDiskWrites()) {
+     *         return Example.doThingThatRequiresDiskWrites();
+     *     }
+     * </pre>
+     *
+     */
+    public static class StrictMode {
+        private StrictMode() {}
+
+        /**
+         * Convenience method for disabling all thread-level StrictMode checks with
+         * try-with-resources. Includes everything listed here:
+         *     https://developer.android.com/reference/android/os/StrictMode.ThreadPolicy.Builder.html
+         */
+        public static CloseableOnMainThread allowAllThreadPolicies() throws Exception {
+            return new CloseableOnMainThread(
+                    () -> { return StrictModeContext.allowAllThreadPolicies(); });
+        }
+
+        /**
+         * Convenience method for disabling StrictMode for disk-writes with try-with-resources.
+         */
+        public static CloseableOnMainThread allowDiskWrites() throws Exception {
+            return new CloseableOnMainThread(() -> { return StrictModeContext.allowDiskWrites(); });
+        }
+    }
 }

chrome/android/javatests/src/org/chromium/chrome/browser/contextmenu/ContextMenuTest.java

@@ -22,7 +22,6 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import org.chromium.base.StrictModeContext;
 import org.chromium.base.test.util.CallbackHelper;
 import org.chromium.base.test.util.CloseableOnMainThread;
 import org.chromium.base.test.util.CommandLineFlags;
@@ -121,8 +120,7 @@ public class ContextMenuTest implements CustomMainActivityStart {
         Tab tab = mDownloadTestRule.getActivity().getActivityTab();
         // Allow DiskWrites temporarily in main thread to avoid
         // violation during copying under emulator environment.
-        try (CloseableOnMainThread c = new CloseableOnMainThread(
-                     () -> { return StrictModeContext.allowDiskWrites(); })) {
+        try (CloseableOnMainThread ignored = CloseableOnMainThread.StrictMode.allowDiskWrites()) {
             ContextMenuUtils.selectContextMenuItem(InstrumentationRegistry.getInstrumentation(),
                     mDownloadTestRule.getActivity(), tab, "testLink",
                     R.id.contextmenu_copy_link_address);
@@ -138,8 +136,7 @@ public class ContextMenuTest implements CustomMainActivityStart {
         Tab tab = mDownloadTestRule.getActivity().getActivityTab();
         // Allow DiskWrites temporarily in main thread to avoid
         // violation during copying under emulator environment.
-        try (CloseableOnMainThread c = new CloseableOnMainThread(
-                     () -> { return StrictModeContext.allowDiskWrites(); })) {
+        try (CloseableOnMainThread ignored = CloseableOnMainThread.StrictMode.allowDiskWrites()) {
             ContextMenuUtils.selectContextMenuItem(InstrumentationRegistry.getInstrumentation(),
                     mDownloadTestRule.getActivity(), tab, "testImageLink",
                     R.id.contextmenu_copy_link_address);
@@ -307,8 +304,7 @@ public class ContextMenuTest implements CustomMainActivityStart {
         Tab tab = mDownloadTestRule.getActivity().getActivityTab();
         // Allow DiskWrites temporarily in main thread to avoid
         // violation during copying under emulator environment.
-        try (CloseableOnMainThread c = new CloseableOnMainThread(
-                     () -> { return StrictModeContext.allowDiskWrites(); })) {
+        try (CloseableOnMainThread ignored = CloseableOnMainThread.StrictMode.allowDiskWrites()) {
             ContextMenuUtils.selectContextMenuItem(InstrumentationRegistry.getInstrumentation(),
                     mDownloadTestRule.getActivity(), tab, "testEmail", R.id.contextmenu_copy);
         }
@@ -326,8 +322,8 @@ public class ContextMenuTest implements CustomMainActivityStart {
         // Allow all thread policies temporarily in main thread to avoid
         // DiskWrite and UnBufferedIo violations during copying under
         // emulator environment.
-        try (CloseableOnMainThread c = new CloseableOnMainThread(
-                     () -> { return StrictModeContext.allowAllThreadPolicies(); })) {
+        try (CloseableOnMainThread ignored =
+                        CloseableOnMainThread.StrictMode.allowAllThreadPolicies()) {
             ContextMenuUtils.selectContextMenuItem(InstrumentationRegistry.getInstrumentation(),
                     mDownloadTestRule.getActivity(), tab, "testTel", R.id.contextmenu_copy);
         }

chrome/android/javatests/src/org/chromium/chrome/browser/contextmenu/RevampedContextMenuTest.java

@@ -20,6 +20,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.chromium.base.test.util.CallbackHelper;
+import org.chromium.base.test.util.CloseableOnMainThread;
 import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeSwitches;
@@ -95,9 +96,13 @@ public class RevampedContextMenuTest implements DownloadTestRule.CustomMainActiv
     @MediumTest
     public void testCopyLinkURL() throws Throwable {
         Tab tab = mDownloadTestRule.getActivity().getActivityTab();
-        RevampedContextMenuUtils.selectContextMenuItem(InstrumentationRegistry.getInstrumentation(),
-                mDownloadTestRule.getActivity(), tab, "testLink",
-                R.id.contextmenu_copy_link_address);
+        // Allow DiskWrites temporarily in main thread to avoid
+        // violation during copying under emulator environment.
+        try (CloseableOnMainThread ignored = CloseableOnMainThread.StrictMode.allowDiskWrites()) {
+            RevampedContextMenuUtils.selectContextMenuItem(
+                    InstrumentationRegistry.getInstrumentation(), mDownloadTestRule.getActivity(),
+                    tab, "testLink", R.id.contextmenu_copy_link_address);
+        }
 
         assertStringContains("test_link.html", getClipboardText());
     }
@@ -193,8 +198,15 @@ public class RevampedContextMenuTest implements DownloadTestRule.CustomMainActiv
     @MediumTest
     public void testCopyEmailAddress() throws Throwable {
         Tab tab = mDownloadTestRule.getActivity().getActivityTab();
-        RevampedContextMenuUtils.selectContextMenuItem(InstrumentationRegistry.getInstrumentation(),
-                mDownloadTestRule.getActivity(), tab, "testEmail", R.id.contextmenu_copy);
+        // Allow all thread policies temporarily in main thread to avoid
+        // DiskWrite and UnBufferedIo violations during copying under
+        // emulator environment.
+        try (CloseableOnMainThread ignored =
+                        CloseableOnMainThread.StrictMode.allowAllThreadPolicies()) {
+            RevampedContextMenuUtils.selectContextMenuItem(
+                    InstrumentationRegistry.getInstrumentation(), mDownloadTestRule.getActivity(),
+                    tab, "testEmail", R.id.contextmenu_copy);
+        }
 
         Assert.assertEquals("Copied email address is not correct",
                 "someone1@example.com,someone2@example.com", getClipboardText());
@@ -204,8 +216,13 @@ public class RevampedContextMenuTest implements DownloadTestRule.CustomMainActiv
     @MediumTest
     public void testCopyTelNumber() throws Throwable {
         Tab tab = mDownloadTestRule.getActivity().getActivityTab();
-        RevampedContextMenuUtils.selectContextMenuItem(InstrumentationRegistry.getInstrumentation(),
-                mDownloadTestRule.getActivity(), tab, "testTel", R.id.contextmenu_copy);
+        // Allow DiskWrites temporarily in main thread to avoid
+        // violation during copying under emulator environment.
+        try (CloseableOnMainThread ignored = CloseableOnMainThread.StrictMode.allowDiskWrites()) {
+            RevampedContextMenuUtils.selectContextMenuItem(
+                    InstrumentationRegistry.getInstrumentation(), mDownloadTestRule.getActivity(),
+                    tab, "testTel", R.id.contextmenu_copy);
+        }
 
         Assert.assertEquals("Copied tel number is not correct", "10000000000", getClipboardText());
     }

chrome/android/javatests/src/org/chromium/chrome/browser/history/HistoryActivityTest.java

@@ -34,6 +34,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.chromium.base.task.PostTask;
+import org.chromium.base.test.util.CloseableOnMainThread;
 import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.Restriction;
 import org.chromium.base.test.util.RetryOnFailure;
@@ -484,6 +485,9 @@ public class HistoryActivityTest {
     @Test
     @SmallTest
     public void testCopyLink() throws Exception {
+        // Allow DiskWrites temporarily in main thread to avoid
+        // violation during copying under emulator environment.
+        try (CloseableOnMainThread ignored = CloseableOnMainThread.StrictMode.allowDiskWrites()) {
             final ClipboardManager clipboardManager = TestThreadUtils.runOnUiThreadBlocking(() -> {
                 ClipboardManager manager =
                         (ClipboardManager) mActivityTestRule.getActivity().getSystemService(
@@ -502,7 +506,9 @@ public class HistoryActivityTest {
 
             // Check that link is copied to the clipboard.
             TestThreadUtils.runOnUiThreadBlocking(
-                () -> Assert.assertTrue(mHistoryManager.getToolbarForTests()
+                    ()
+                            -> Assert.assertTrue(
+                                    mHistoryManager.getToolbarForTests()
                                             .getMenu()
                                             .performIdentifierAction(
                                                     R.id.selection_mode_copy_link, 0)));
@@ -518,6 +524,7 @@ public class HistoryActivityTest {
             toggleItemSelection(3);
             Assert.assertFalse(toolbar.getItemById(R.id.selection_mode_copy_link).isVisible());
         }
+    }
 
     // TODO(yolandyan): rewrite this with espresso
     private void toggleItemSelection(int position) throws Exception {

chrome/android/javatests/src/org/chromium/chrome/browser/omnibox/UrlBarIntegrationTest.java

@@ -20,6 +20,7 @@ import org.junit.runner.RunWith;
 
 import org.chromium.base.test.params.ParameterizedCommandLineFlags;
 import org.chromium.base.test.params.ParameterizedCommandLineFlags.Switches;
+import org.chromium.base.test.util.CloseableOnMainThread;
 import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.Feature;
 import org.chromium.base.test.util.RetryOnFailure;
@@ -113,11 +114,15 @@ public class UrlBarIntegrationTest {
     @SmallTest
     @Feature({"Omnibox"})
     @RetryOnFailure
-    public void testCopyHuge() {
+    public void testCopyHuge() throws Throwable {
         mActivityTestRule.startMainActivityWithURL(HUGE_URL);
         OmniboxTestUtils.toggleUrlBarFocus(getUrlBar(), true);
+        // Allow DiskWrites temporarily in main thread to avoid
+        // violation during copying under emulator environment.
+        try (CloseableOnMainThread ignored = CloseableOnMainThread.StrictMode.allowDiskWrites()) {
             Assert.assertEquals(HUGE_URL, copyUrlToClipboard(android.R.id.copy));
         }
+    }
 
     @Test
     @SmallTest