Add timestamp support to the Previews infobar

chrome/browser/ui/android/infobars/previews_infobar.cc

Index: chrome/browser/ui/android/infobars/previews_infobar.cc
diff --git a/chrome/browser/ui/android/infobars/previews_infobar.cc b/chrome/browser/ui/android/infobars/previews_infobar.cc
new file mode 100644
index 0000000000000000000000000000000000000000..29b52f7ba7f4af6b75255b7b90e411abca08cfe3
--- /dev/null
+++ b/chrome/browser/ui/android/infobars/previews_infobar.cc
@@ -0,0 +1,42 @@
+// Copyright 2017 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.
+
+#include "chrome/browser/ui/android/infobars/previews_infobar.h"
+
+#include <utility>
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/memory/ptr_util.h"
+#include "jni/PreviewsInfoBar_jni.h"
+
+PreviewsInfoBar::PreviewsInfoBar(
+    std::unique_ptr<PreviewsInfoBarDelegate> delegate)
+    : ConfirmInfoBar(std::move(delegate)) {}
+
+PreviewsInfoBar::~PreviewsInfoBar() {}
+
+base::android::ScopedJavaLocalRef<jobject> PreviewsInfoBar::CreateRenderInfoBar(
+    JNIEnv* env) {
+  PreviewsInfoBarDelegate* delegate =
+      GetDelegate()->AsPreviewsInfoBarDelegate();
+  if (!delegate)

[Peter Kasting, 2017/05/08 23:33:35]

When could there be no delegate?  It seems like this shouldn't be able to fail. 
In that case, I would remove the conditional.

In either case, it seems like this can never be called with a delegate of a
different type than PreviewsInfoBarDelegate.  If so, then don't add the virtual
downcast method; those are only needed for the equivalent of dynamic_cast.  You
can just do a static_cast here to get the right type.

[megjablon, 2017/05/09 00:14:30]

Done.

+    return nullptr;
+  base::android::ScopedJavaLocalRef<jstring> message_text =
+      base::android::ConvertUTF16ToJavaString(env, delegate->GetMessageText());
+  base::android::ScopedJavaLocalRef<jstring> link_text =
+      base::android::ConvertUTF16ToJavaString(env, delegate->GetLinkText());
+  base::android::ScopedJavaLocalRef<jstring> timestamp_text =
+      base::android::ConvertUTF16ToJavaString(env,
+                                              delegate->GetTimestampText());
+  return Java_PreviewsInfoBar_show(env, GetEnumeratedIconId(), message_text,
+                                   link_text, timestamp_text);
+}
+
+// static
+std::unique_ptr<infobars::InfoBar> PreviewsInfoBar::CreateInfoBar(
+    infobars::InfoBarManager* infobar_manager,
+    std::unique_ptr<PreviewsInfoBarDelegate> delegate) {
+  return base::MakeUnique<PreviewsInfoBar>(std::move(delegate));
+}