Add Generic Implementation of ClipboardRecentContent

components/open_from_clipboard/clipboard_recent_content_generic.cc

+// 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 "components/open_from_clipboard/clipboard_recent_content_generic.h"
+
+#include "ui/base/clipboard/clipboard.h"
+
+ClipboardRecentContentGeneric::ClipboardRecentContentGeneric() {}
+
+bool ClipboardRecentContentGeneric::GetRecentURLFromClipboard(GURL* url) {
+  ui::Clipboard* clipboard = ui::Clipboard::GetForCurrentThread();
+  base::Time last_modified_time = clipboard->GetClipboardLastModifiedTime();
+  if (!last_modified_time_to_suppress_.is_null() &&
+      (last_modified_time == last_modified_time_to_suppress_))
+    return false;
+
+  if (GetClipboardContentAge() > kMaximumAgeOfClipboard)
+    return false;
+
+  // Interpret the clipboard as a URL if possible.
+  std::string gurl_string;
+  clipboard->ReadAsciiText(ui::CLIPBOARD_TYPE_COPY_PASTE, &gurl_string);
+  DCHECK(url);
+  if (!gurl_string.empty()) {
+    *url = GURL(gurl_string);
+  } else {
+    // Fall back to unicode / utf16, as some URLs may use international domain
+    // names, not punycode.
+    base::string16 gurl_string16;
+    clipboard->ReadText(ui::CLIPBOARD_TYPE_COPY_PASTE, &gurl_string16);
+    if (!gurl_string16.empty())
+      *url = GURL(gurl_string16);
+  }
+  return url->is_valid() && IsAppropriateSuggestion(*url);
+}
+
+base::TimeDelta ClipboardRecentContentGeneric::GetClipboardContentAge() const {
+  const base::Time last_modified_time =
+      ui::Clipboard::GetForCurrentThread()->GetClipboardLastModifiedTime();
+  const base::Time now = base::Time::Now();
+  // In case of system clock change, assume the last modified time is now.
+  // (Don't return a negative age, i.e., a time in the future.)
+  if (last_modified_time > now)
+    return base::TimeDelta();
+  return now - last_modified_time;
+}
+
+void ClipboardRecentContentGeneric::SuppressClipboardContent() {
+  // User cleared the user data.  The pasteboard entry must be removed from the
+  // omnibox list.  Do this by suppressing all clipboard content with the
+  // current clipboard content's time.  Then we only suggest the clipboard
+  // content later if the time changed.
+  last_modified_time_to_suppress_ =
+      ui::Clipboard::GetForCurrentThread()->GetClipboardLastModifiedTime();
+}