discardable_memory: Using mojo IPC to replace Chrome IPC

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>
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 // In single-process mode used for debugging, we don't pass a renderer client
 // ID via command line because RenderThreadImpl lives in the same process as
 // the browser
 RenderThreadImpl::RenderThreadImpl(
     const InProcessChildThreadParams& params,
     std::unique_ptr<blink::scheduler::RendererScheduler> scheduler,
     scoped_refptr<base::SingleThreadTaskRunner>& resource_task_queue)
     : ChildThreadImpl(Options::Builder()
                           .InBrowserProcess(params)
                           .AutoStartServiceManagerConnection(false)
+                          .InitDiscardableMemory(true)
                           .ConnectToBrowser(true)
                           .Build()),
       renderer_scheduler_(std::move(scheduler)),
       categorized_worker_pool_(new CategorizedWorkerPool()),
       renderer_binding_(this),
       client_id_(1) {
   Init(resource_task_queue);
 }
 
 // When we run plugins in process, we actually run them on the render thread,
 // which means that we need to make the render thread pump UI events.
 RenderThreadImpl::RenderThreadImpl(
     std::unique_ptr<base::MessageLoop> main_message_loop,
     std::unique_ptr<blink::scheduler::RendererScheduler> scheduler)
     : ChildThreadImpl(Options::Builder()
                           .AutoStartServiceManagerConnection(false)
                           .ConnectToBrowser(true)
+                          .InitDiscardableMemory(true)
                           .Build()),
       renderer_scheduler_(std::move(scheduler)),
       main_message_loop_(std::move(main_message_loop)),
       categorized_worker_pool_(new CategorizedWorkerPool()),
       renderer_binding_(this) {
   scoped_refptr<base::SingleThreadTaskRunner> test_task_counter;
   DCHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kRendererClientId));
   base::StringToInt(base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
                         switches::kRendererClientId),
@@ skipping 1856 matching lines @@
   }
 }
 
 void RenderThreadImpl::OnRendererInterfaceRequest(
     mojom::RendererAssociatedRequest request) {
   DCHECK(!renderer_binding_.is_bound());
   renderer_binding_.Bind(std::move(request));
 }
 
 }  // namespace content