Add flags to enable screen orientation lock for fullscreen video on Android.

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 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 "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
 
@@ skipping 1022 matching lines @@
 
   // Force preload=none and disable autoplay on older or low end Android
   // platforms because their media pipelines are not stable enough to handle
   // concurrent elements. See http://crbug.com/612909, http://crbug.com/622826.
   const bool is_low_end_device =
       base::android::BuildInfo::GetInstance()->sdk_int() <=
           base::android::SDK_VERSION_JELLY_BEAN_MR2 ||
       base::SysInfo::IsLowEndDevice();
   // TODO(mlamouri): rename this setting "isLowEndDevice".
   settings->setForcePreloadNoneForMediaElements(is_low_end_device);
+
+  WebRuntimeFeatures::enableVideoFullscreenOrientationLock(
+      prefs.video_fullscreen_orientation_lock_enabled);
 #endif
 
   settings->setViewportEnabled(prefs.viewport_enabled);
   settings->setViewportMetaEnabled(prefs.viewport_meta_enabled);
   settings->setShrinksViewportContentToFit(
         prefs.shrinks_viewport_contents_to_fit);
   settings->setViewportStyle(
       static_cast<blink::WebViewportStyle>(prefs.viewport_style));
 
   settings->setLoadWithOverviewMode(prefs.initialize_at_minimum_page_scale);
@@ skipping 1759 matching lines @@
                             INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   }
 
   std::unique_ptr<InputEventAck> ack(
       new InputEventAck(InputEventAckSource::MAIN_THREAD, input_event->type,
                         INPUT_EVENT_ACK_STATE_NOT_CONSUMED));
   OnInputEventAck(std::move(ack));
 }
 
 }  // namespace content