getInstalledRelatedApps: Introduce random delay to stop timing attacks.

content/public/android/BUILD.gn

Index: content/public/android/BUILD.gn
diff --git a/content/public/android/BUILD.gn b/content/public/android/BUILD.gn
index ca4005baa1eac333742eb8e3fc8e73416c1fc185..6015058f250ce5fbc05c03f7d5c5548acae67887 100644
--- a/content/public/android/BUILD.gn
+++ b/content/public/android/BUILD.gn
@@ -198,6 +198,7 @@ android_library("content_java") {
     "java/src/org/chromium/content/browser/input/ThreadedInputConnectionProxyView.java",
     "java/src/org/chromium/content/browser/installedapp/InstalledAppProviderFactory.java",
     "java/src/org/chromium/content/browser/installedapp/InstalledAppProviderImpl.java",
+    "java/src/org/chromium/content/browser/installedapp/PackageHash.java",
     "java/src/org/chromium/content/browser/picker/DateDialogNormalizer.java",
     "java/src/org/chromium/content/browser/picker/DatePickerDialogCompat.java",
     "java/src/org/chromium/content/browser/picker/DateTimePickerDialog.java",
@@ -469,6 +470,7 @@ junit_binary("content_junit_tests") {
     "junit/src/org/chromium/content/browser/picker/DateDialogNormalizerTest.java",
     "junit/src/org/chromium/content/browser/BindingManagerImplTest.java",
     "junit/src/org/chromium/content/browser/installedapp/InstalledAppProviderTest.java",
+    "junit/src/org/chromium/content/browser/installedapp/PackageHashTest.java",
   ]
   deps = [
     ":content_java",