Disable raf alignment when the compositor doesn't generate begin frames.

content/renderer/render_widget.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_widget.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 1294 matching lines @@
   compositor_->SetRasterColorSpace(screen_info_.icc_profile.GetColorSpace());
   compositor_->SetContentSourceId(current_content_source_id_);
 #if defined(USE_AURA)
   RendererWindowTreeClient* window_tree_client =
       RendererWindowTreeClient::Get(routing_id_);
   if (window_tree_client)
     compositor_->SetLocalSurfaceId(window_tree_client->local_surface_id());
 #endif
   // For background pages and certain tests, we don't want to trigger
   // CompositorFrameSink creation.
-  if (compositor_never_visible_ || !RenderThreadImpl::current())
+  bool should_geneate_frame_sink =

[aelias_OOO_until_Jul13, 2017/04/21 21:45:28]

typo: "generate"

[dtapuska, 2017/04/24 13:44:01]

ugh. Done.

+      !compositor_never_visible_ && RenderThreadImpl::current();
+  if (!should_geneate_frame_sink)
     compositor_->SetNeverVisible();
 
   StartCompositor();
   DCHECK_NE(MSG_ROUTING_NONE, routing_id_);
   compositor_->SetFrameSinkId(
       cc::FrameSinkId(RenderThread::Get()->GetClientId(), routing_id_));
 
   RenderThreadImpl* render_thread = RenderThreadImpl::current();
   // render_thread may be NULL in tests.
   InputHandlerManager* input_handler_manager =
       render_thread ? render_thread->input_handler_manager() : NULL;
   if (input_handler_manager) {
     input_event_queue_ = new MainThreadEventQueue(
         this, render_thread->GetRendererScheduler()->CompositorTaskRunner(),
-        render_thread->GetRendererScheduler());
+        render_thread->GetRendererScheduler(), should_geneate_frame_sink);
     input_handler_manager->AddInputHandler(
         routing_id_, compositor()->GetInputHandler(), input_event_queue_,
         weak_ptr_factory_.GetWeakPtr(),
         compositor_deps_->IsScrollAnimatorEnabled());
     has_added_input_handler_ = true;
   }
 
   return compositor_.get();
 }
 
@@ skipping 989 matching lines @@
     // browser side (https://crbug.com/669219).
     // If there is no WebFrameWidget, then there will be no
     // InputMethodControllers for a WebLocalFrame.
     return nullptr;
   }
   return static_cast<blink::WebFrameWidget*>(GetWebWidget())
       ->GetActiveWebInputMethodController();
 }
 
 }  // namespace content