scheduler: Tell v8 about the current RAIL mode

content/renderer/render_thread_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_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 1143 matching lines @@
   SetRuntimeFeaturesDefaultsAndUpdateFromArgs(command_line);
 
   blink_platform_impl_.reset(new RendererBlinkPlatformImpl(
       renderer_scheduler_.get(),
       remote_interfaces()->GetWeakPtr()));
   blink::initialize(blink_platform_impl_.get());
 
   v8::Isolate* isolate = blink::mainThreadIsolate();
   isolate->SetCreateHistogramFunction(CreateHistogram);
   isolate->SetAddHistogramSampleFunction(AddHistogramSample);
+  renderer_scheduler_->SetMainThreadIsolate(isolate);

[jochen (gone - plz use gerrit), 2016/06/27 11:34:00]

when we shutdown webkit, the isolate is destroyed. should we tell the scheduler
about this as well?

[Sami, 2016/06/27 18:04:46]

There is an explicit call to shut down the scheduler before that happens. The
scheduler won't touch anything blink-related after that, but I'll add code to
clear the isolate there to make it more explicit.

 
   main_thread_compositor_task_runner_ =
       renderer_scheduler_->CompositorTaskRunner();
 
   main_input_callback_.Reset(
       base::Bind(base::IgnoreResult(&RenderThreadImpl::OnMessageReceived),
                  base::Unretained(this)));
 
   scoped_refptr<base::SingleThreadTaskRunner> resource_task_queue2;
   if (resource_task_queue) {
@@ skipping 1043 matching lines @@
       v8_memory_pressure_level == v8::MemoryPressureLevel::kCritical)
     v8_memory_pressure_level = v8::MemoryPressureLevel::kModerate;
 
   blink::mainThreadIsolate()->MemoryPressureNotification(
       v8_memory_pressure_level);
   blink::MemoryPressureNotificationToWorkerThreadIsolates(
       v8_memory_pressure_level);
 }
 
 }  // namespace content