Add InfoBar delegate for previews

chrome/browser/previews/previews_infobar_delegate.cc

+// Copyright 2016 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/previews/previews_infobar_delegate.h"
+
+#include "chrome/browser/android/android_theme_resources.h"
+#include "chrome/browser/infobars/infobar_service.h"
+#include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
+#include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings_factory.h"
+#include "chrome/grit/generated_resources.h"
+#include "components/infobars/core/infobar.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/web_contents.h"
+#include "ui/base/l10n/l10n_util.h"
+
+PreviewsInfoBarDelegate::~PreviewsInfoBarDelegate() {}
+
+// static
+void PreviewsInfoBarDelegate::Create(content::WebContents* web_contents,
+                                     PreviewsInfoBarType infobar_type) {
+  // TODO: Check that infobar was not already shown.

[bengr, 2016/08/25 23:26:18]

// TODO(megjablon): Check that the infobar was not already shown.

[megjablon, 2016/08/26 22:47:30]

Done.

+
+  InfoBarService* infobar_service =
+      InfoBarService::FromWebContents(web_contents);
+
+  infobars::InfoBar* infobar =
+      infobar_service->AddInfoBar(infobar_service->CreateConfirmInfoBar(
+          std::unique_ptr<ConfirmInfoBarDelegate>(
+              new PreviewsInfoBarDelegate(web_contents, infobar_type))));

[bengr, 2016/08/25 23:26:18]

You can use base::MakeUnique<PreviewsInfobarDelegate>(web_contents,
infobar_type);

[Peter Kasting, 2016/08/25 23:55:18]

Nope.  I already suggested that and quickly withdrew it when I remembered that
the constructor is private.

+
+  if (infobar && (infobar_type == LITE_PAGE || infobar_type == LOFI)) {
+    auto* data_reduction_proxy_settings =
+        DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
+            web_contents->GetBrowserContext());
+    if (data_reduction_proxy_settings)

[bengr, 2016/08/25 23:26:18]

Can this ever be null?

[megjablon, 2016/08/26 22:47:30]

Nope, we shouldn't be showing a LoFi or Lite Page snackbar if we don't have the
DRP enabled and therefore will have a DRPSettings object. Removed.

+      data_reduction_proxy_settings->IncrementLoFiUIShown();
+  }
+}
+
+PreviewsInfoBarDelegate::PreviewsInfoBarDelegate(
+    content::WebContents* web_contents,
+    PreviewsInfoBarType infobar_type)
+    : ConfirmInfoBarDelegate(),
+      infobar_type_(infobar_type) {}
+
+infobars::InfoBarDelegate::InfoBarIdentifier
+PreviewsInfoBarDelegate::GetIdentifier() const {
+  return DATA_REDUCTION_PROXY_PREVIEW_INFOBAR_DELEGATE;
+}
+
+int PreviewsInfoBarDelegate::GetIconId() const {
+#if defined(OS_ANDROID)
+  return IDR_ANDROID_INFOBAR_PREVIEWS;
+#else
+  return kNoIconID;
+#endif
+}
+
+bool PreviewsInfoBarDelegate::ShouldExpire(
+    const NavigationDetails& details) const {
+  // TODO: record uma data

[bengr, 2016/08/25 23:26:18]

// TODO(megjablon): Record UMA data.

[megjablon, 2016/08/26 22:47:30]

Done.

+  return InfoBarDelegate::ShouldExpire(details);
+}
+
+base::string16 PreviewsInfoBarDelegate::GetMessageText() const {
+  return l10n_util::GetStringUTF16((infobar_type_ == OFFLINE)
+                                       ? IDS_PREVIEWS_INFOBAR_FASTER_PAGE_TITLE
+                                       : IDS_PREVIEWS_INFOBAR_SAVED_DATA_TITLE);
+}
+
+int PreviewsInfoBarDelegate::GetButtons() const {
+  return BUTTON_NONE;
+}
+
+base::string16 PreviewsInfoBarDelegate::GetLinkText() const {
+  return l10n_util::GetStringUTF16(IDS_PREVIEWS_INFOBAR_LINK);
+}
+
+bool PreviewsInfoBarDelegate::LinkClicked(WindowOpenDisposition disposition) {
+  // TODO: record uma data

[bengr, 2016/08/25 23:26:18]

// TODO(megjablon): Record UMA data.

[megjablon, 2016/08/26 22:47:30]

Done.

+  if (infobar_type_ == LITE_PAGE || infobar_type_ == LOFI) {
+    auto* web_contents =
+        InfoBarService::WebContentsFromInfoBar(infobar());
+
+    if (infobar_type_ == LITE_PAGE)

[bengr, 2016/08/25 23:26:19]

This might be a little clearer with a switch. 

[Peter Kasting, 2016/08/25 23:55:18]

I don't think so:

    switch (infobar_type) {
      case LITE_PAGE:
        web_contents->GetController().ReloadDisableLoFi(true);
        break;
      case LOFI:
        web_contents->ReloadLoFiImages();
        break;
      default:
        break;
    }

...seems strictly worse.

I would suggest sticking an "else" at the beginning of the second "if" that's
here, though.

[megjablon, 2016/08/26 22:47:30]

Done.

+      web_contents->GetController().ReloadDisableLoFi(true);
+    if (infobar_type_ == LOFI)
+      web_contents->ReloadLoFiImages();
+
+    auto* data_reduction_proxy_settings =
+        DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
+            web_contents->GetBrowserContext());
+    if (data_reduction_proxy_settings)

[bengr, 2016/08/25 23:26:18]

Can this ever be null?

[megjablon, 2016/08/26 22:47:30]

Nope, we shouldn't be showing a LoFi or Lite Page snackbar if we don't have the
DRP enabled and therefore will have a DRPSettings object. Removed.

+      data_reduction_proxy_settings->IncrementLoFiUserRequestsForImages();
+  }
+
+  return true;
+}