Adds command line switch to disable resize lock

content/browser/renderer_host/delegated_frame_host.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 "content/browser/renderer_host/delegated_frame_host.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 102 matching lines @@
       can_lock_compositor_ == NO_PENDING_COMMIT;
 
   if (can_lock_compositor_ == YES_CAN_LOCK)
     can_lock_compositor_ = YES_DID_LOCK;
 
   resize_lock_ =
       client_->DelegatedFrameHostCreateResizeLock(defer_compositor_lock);
 }
 
 bool DelegatedFrameHost::ShouldCreateResizeLock() {
+  static const bool is_enabled =
+      !base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableResizeLock) ||
+      base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          switches::kEnableResizeLock) == "true";

[piman, 2016/07/08 18:42:44]

Do you want instead do a --disable-resize-lock?

Otherwise, this is a bit confusing, since adding --enable-resize-lock (and no
value) to the command line will disable the locks.

[sky, 2016/07/08 19:16:53]

I was trying to avoid the negative, but you're right, --disable-resize-lock is
simpler.

+  if (!is_enabled)
+    return false;
+
   if (!client_->DelegatedFrameCanCreateResizeLock())
     return false;
 
   if (resize_lock_)
     return false;
 
   gfx::Size desired_size = client_->DelegatedFrameHostDesiredSizeInDIP();
   if (desired_size == current_frame_size_in_dip_ || desired_size.IsEmpty())
     return false;
 
@@ skipping 760 matching lines @@
     cc::SurfaceManager* manager = factory->GetSurfaceManager();
     new_layer->SetShowSurface(
         surface_id_, base::Bind(&SatisfyCallback, base::Unretained(manager)),
         base::Bind(&RequireCallback, base::Unretained(manager)),
         current_surface_size_, current_scale_factor_,
         current_frame_size_in_dip_);
   }
 }
 
 }  // namespace content