Add --enable-device-orientation switch and set ENABLE_DEVICE_ORIENTATION=1

chrome/renderer/render_thread.cc

 // Copyright (c) 2010 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/renderer/render_thread.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 875 matching lines @@
   WebRuntimeFeatures::enableGeolocation(
       !command_line.HasSwitch(switches::kDisableGeolocation));
 
   WebRuntimeFeatures::enableWebGL(
       command_line.HasSwitch(switches::kEnableExperimentalWebGL));
 
   WebRuntimeFeatures::enablePushState(true);
 
   WebRuntimeFeatures::enableTouch(
       command_line.HasSwitch(switches::kEnableTouch));
+
+  WebRuntimeFeatures::enableDeviceOrientation(
+      command_line.HasSwitch(switches::kEnableDeviceOrientation));
 }
 
 void RenderThread::IdleHandler() {
 #if (defined(OS_WIN) || defined(OS_LINUX)) && defined(USE_TCMALLOC)
   MallocExtension::instance()->ReleaseFreeMemory();
 #endif
 
   v8::V8::IdleNotification();
 
   // Schedule next invocation.
@@ skipping 135 matching lines @@
 }
 
 std::string RenderThread::GetExtensionIdByBrowseExtent(const GURL& url) {
   for (size_t i = 0; i < extension_extents_.size(); ++i) {
     if (extension_extents_[i].browse_extent.ContainsURL(url))
       return extension_extents_[i].extension_id;
   }
 
   return std::string();
 }