Add an external protocol dialog for ARC

chrome/browser/chromeos/arc/page_transition_util.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/chromeos/arc/page_transition_util.h"
+
+namespace arc {
+
+bool ShouldIgnoreNavigation(ui::PageTransition page_transition) {
+  // Mask out any redirect qualifiers - this method handles navigation from
+  // redirect and non-redirect navigations equivalently.
+  page_transition = ui::PageTransitionFromInt(
+      page_transition & ~ui::PAGE_TRANSITION_IS_REDIRECT_MASK);
+
+  if (!ui::PageTransitionCoreTypeIs(page_transition,
+                                    ui::PAGE_TRANSITION_LINK)) {
+    // Do not handle the |url| if this event wasn't spawned by the user clicking
+    // on a link.
+    return true;
+  }
+
+  if (ui::PageTransitionGetQualifier(page_transition) != 0) {
+    // Qualifiers indicate that this navigation was the result of a click on a
+    // forward/back button, or typing in the URL bar, etc.  Don't handle any of
+    // those types of navigations.
+    return true;
+  }
+
+  return false;
+}
+
+}  // namespace arc