Add blink::WebInputEvent::IsPinchGestureEventType().

chrome/browser/chromeos/login/ui/webui_login_view.cc

 // Copyright 2014 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/login/ui/webui_login_view.h"
 
 #include "ash/focus_cycler.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray.h"
 #include "base/bind.h"
@@ skipping 521 matching lines @@
     const GURL& security_origin,
     content::MediaStreamType type) {
   return MediaCaptureDevicesDispatcher::GetInstance()
       ->CheckMediaAccessPermission(web_contents, security_origin, type);
 }
 
 bool WebUILoginView::PreHandleGestureEvent(
     content::WebContents* source,
     const blink::WebGestureEvent& event) {
   // Disable pinch zooming.
-  return event.GetType() == blink::WebGestureEvent::kGesturePinchBegin ||
-         event.GetType() == blink::WebGestureEvent::kGesturePinchUpdate ||
-         event.GetType() == blink::WebGestureEvent::kGesturePinchEnd;
+  return blink::WebInputEvent::IsPinchGestureEventType(event.GetType());
 }
 
 void WebUILoginView::OnLoginPromptVisible() {
   // If we're hidden than will generate this signal once we're shown.
   if (is_hidden_ || webui_visible_) {
     VLOG(1) << "Login WebUI >> not emitting signal, hidden: " << is_hidden_;
     return;
   }
   TRACE_EVENT0("chromeos", "WebUILoginView::OnLoginPromptVisible");
   if (should_emit_login_prompt_visible_) {
     VLOG(1) << "Login WebUI >> login-prompt-visible";
     chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
         EmitLoginPromptVisible();
   }
 
   webui_visible_ = true;
 }
 
 }  // namespace chromeos