Include origin in background fetch desktop download notifications

The origin will be displayed in the status section of the notification.
Very long origins will be elided to display the eTLD+1.

Screenshots:
https://lh3.googleusercontent.com/-eFfCFlWJf3Y/W7NlhkLY07I/AAAAAAAABMw/_RhaEe6jlnM1X-xXfsIoZ7uyJOnfd6JngCL0BGAYYCw/h48/desktoporigin1.png
https://lh3.googleusercontent.com/-TiCAYHS9hfg/W7Nlep2HgkI/AAAAAAAABMk/cG6uFKK8sBcc8P-cmy9HtqEZHTp_2S2hgCL0BGAYYCw/h50/desktoporiginevil.png

Bug: 774612
Change-Id: Iacd874b5fd03f3e6e37c204e9df9e4cbaba67435
Reviewed-on: https://chromium-review.googlesource.com/1256943Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596262}

chrome/browser/download/download_ui_model.cc

@@ -461,6 +461,14 @@ GURL DownloadUIModel::GetURL() const {
   return GURL();
 }
 
+GURL DownloadUIModel::GetOriginalURL() const {
+  return GURL();
+}
+
+bool DownloadUIModel::ShouldPromoteOrigin() const {
+  return false;
+}
+
 #if !defined(OS_ANDROID)
 bool DownloadUIModel::IsCommandEnabled(
     const DownloadCommands* download_commands,

chrome/browser/download/download_ui_model.h

@@ -278,6 +278,13 @@ class DownloadUIModel {
   // |FailState::NO_FAILURE| if there is no previous failure reason.
   virtual offline_items_collection::FailState GetLastFailState() const;
 
+  // Returns the URL of the orginiating request.
+  virtual GURL GetOriginalURL() const;
+
+  // Whether the Origin should be clearly displayed in the notification for
+  // security reasons.
+  virtual bool ShouldPromoteOrigin() const;
+
 #if !defined(OS_ANDROID)
   // Methods related to DownloadCommands.
   // Returns whether the given download command is enabled for this download.

chrome/browser/download/offline_item_model.cc

@@ -236,6 +236,15 @@ FailState OfflineItemModel::GetLastFailState() const {
   return offline_item_ ? offline_item_->fail_state : FailState::USER_CANCELED;
 }
 
+GURL OfflineItemModel::GetOriginalURL() const {
+  return offline_item_ ? offline_item_->original_url : GURL();
+}
+
+bool OfflineItemModel::ShouldPromoteOrigin() const {
+  // TODO(crbug.com/774612): Add a field in OfflineItem to make this decision.
+  return true;
+}
+
 #if !defined(OS_ANDROID)
 bool OfflineItemModel::IsCommandEnabled(
     const DownloadCommands* download_commands,

chrome/browser/download/offline_item_model.h

@@ -57,6 +57,8 @@ class OfflineItemModel : public DownloadUIModel,
   GURL GetURL() const override;
   bool ShouldRemoveFromShelfWhenComplete() const override;
   offline_items_collection::FailState GetLastFailState() const override;
+  GURL GetOriginalURL() const override;
+  bool ShouldPromoteOrigin() const override;
 
 #if !defined(OS_ANDROID)
   bool IsCommandEnabled(const DownloadCommands* download_commands,

chrome/browser/ui/views/download/download_item_view.cc

@@ -21,6 +21,7 @@
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "build/build_config.h"
 #include "chrome/app/vector_icons/vector_icons.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/chrome_download_manager_delegate.h"
@@ -40,6 +41,7 @@
 #include "components/download/public/common/download_danger_type.h"
 #include "components/prefs/pref_service.h"
 #include "components/safe_browsing/common/safe_browsing_prefs.h"
+#include "components/url_formatter/elide_url.h"
 #include "components/vector_icons/vector_icons.h"
 #include "content/public/browser/download_item_utils.h"
 #include "third_party/icu/source/common/unicode/uchar.h"
@@ -236,7 +238,7 @@ void DownloadItemView::OnDownloadUpdated() {
   if (IsShowingWarningDialog() != model_->IsDangerous()) {
     ToggleWarningDialog();
   } else {
-    status_text_ = model_->GetStatusText();
+    status_text_ = GetStatusText();
     switch (model_->GetState()) {
       case DownloadItem::IN_PROGRESS:
         // No need to send accessible alert for "paused", as the button ends
@@ -1167,3 +1169,20 @@ SkColor DownloadItemView::GetTextColor() const {
 SkColor DownloadItemView::GetDimmedTextColor() const {
   return SkColorSetA(GetTextColor(), 0xC7);
 }
+
+base::string16 DownloadItemView::GetStatusText() const {
+  if (!model_->ShouldPromoteOrigin() ||
+      model_->GetOriginalURL().GetOrigin().is_empty()) {
+    // Use the default status text.
+    return model_->GetStatusText();
+  }
+
+#if !defined(OS_ANDROID)
+  return url_formatter::ElideUrl(model_->GetOriginalURL().GetOrigin(),
+                                 status_font_list_, kTextWidth,
+                                 gfx::Typesetter::BROWSER);
+#else
+  NOTREACHED();
+  return base::string16();
+#endif
+}

chrome/browser/ui/views/download/download_item_view.h

@@ -309,6 +309,9 @@ class DownloadItemView : public views::InkDropHostView,
   // Returns a slightly dimmed version of the base text color.
   SkColor GetDimmedTextColor() const;
 
+  // Returns the status text to show in the notification.
+  base::string16 GetStatusText() const;
+
   // The download shelf that owns us.
   DownloadShelfView* shelf_;