Enabling new-style 'virtual viewport' pinch by default on ChromeOS

content/browser/renderer_host/render_view_host_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/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 418 matching lines @@
   prefs.accelerated_compositing_for_3d_transforms_enabled =
       prefs.accelerated_compositing_for_animation_enabled =
           !command_line.HasSwitch(switches::kDisableAcceleratedLayers);
   prefs.accelerated_compositing_for_plugins_enabled = true;
   prefs.accelerated_compositing_for_video_enabled =
       !command_line.HasSwitch(switches::kDisableAcceleratedVideo);
   prefs.lazy_layout_enabled =
       command_line.HasSwitch(switches::kEnableExperimentalWebPlatformFeatures);
   prefs.region_based_columns_enabled =
       command_line.HasSwitch(switches::kEnableRegionBasedColumns);
-  if (command_line.HasSwitch(cc::switches::kEnablePinchVirtualViewport)) {
+
+#if defined(OS_CHROMEOS)
+  bool enable_pinch_virtual_viewport = true;
+#else
+  bool enable_pinch_virtual_viewport =
+      command_line.HasSwitch(cc::switches::kEnablePinchVirtualViewport);
+#endif
+  if (enable_pinch_virtual_viewport) {
     prefs.pinch_virtual_viewport_enabled = true;
     prefs.pinch_overlay_scrollbar_thickness = 10;
   }
   prefs.use_solid_color_scrollbars = ui::IsOverlayScrollbarEnabled();
 
 #if defined(OS_ANDROID)
   prefs.user_gesture_required_for_media_playback = !command_line.HasSwitch(
       switches::kDisableGestureRequirementForMediaPlayback);
 #endif
 
@@ skipping 1308 matching lines @@
   return true;
 }
 
 void RenderViewHostImpl::AttachToFrameTree() {
   FrameTree* frame_tree = delegate_->GetFrameTree();
 
   frame_tree->ResetForMainFrameSwap();
 }
 
 }  // namespace content