DoubleTap Zoom support for Mobile Viewport pages

content/browser/renderer_host/frame_metadata_util.h

 // Copyright (c) 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_FRAME_METADATA_UTIL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_FRAME_METADATA_UTIL_H_
 
 #include "content/common/content_export.h"
 
 namespace cc {
 class CompositorFrameMetadata;
 }
 
 namespace content {
 
 // Decides whether frame metadata corresponds to mobile-optimized content.
 // By default returns |false|, except for the following cases:
 // - page that has a width=device-width or narrower viewport
 //   (indicating that this is a mobile-optimized or responsive web design);
 // - page that prevents zooming in or out.
 CONTENT_EXPORT bool IsMobileOptimizedFrame(
-    const cc::CompositorFrameMetadata& frame_metadata);
+    const cc::CompositorFrameMetadata& frame_metadata,
+    bool force_enable_zoom);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_FRAME_METADATA_UTIL_H_