Add blink::ServiceRegistry and expose it from LocalFrame and Platform.

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 1212 matching lines @@
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
 
 #ifdef ENABLE_VTUNE_JIT_INTERFACE
   if (command_line.HasSwitch(switches::kEnableVtune))
     gin::Debug::SetJitCodeEventHandler(vTune::GetVtuneCodeEventHandler());
 #endif
 
   SetRuntimeFeaturesDefaultsAndUpdateFromArgs(command_line);
 
-  blink_platform_impl_.reset(
-      new RendererBlinkPlatformImpl(renderer_scheduler_.get()));
+  blink_platform_impl_.reset(new RendererBlinkPlatformImpl(
+      renderer_scheduler_.get(),
+      static_cast<ServiceRegistryImpl*>(service_registry())->GetWeakPtr()));

[dcheng, 2016/03/31 20:16:08]

Unrelated to this patch, but maybe ChildThreadImpl::service_registry() should
just return a ServiceRegistryImp, downcasting is ugly.

   blink::initialize(blink_platform_impl_.get());
 
   v8::Isolate* isolate = blink::mainThreadIsolate();
   isolate->SetCreateHistogramFunction(CreateHistogram);
   isolate->SetAddHistogramSampleFunction(AddHistogramSample);
 
   main_thread_compositor_task_runner_ =
       renderer_scheduler_->CompositorTaskRunner();
 
   main_input_callback_.Reset(
@@ skipping 933 matching lines @@
 }
 
 void RenderThreadImpl::PendingRenderFrameConnect::OnConnectionError() {
   size_t erased =
       RenderThreadImpl::current()->pending_render_frame_connects_.erase(
           routing_id_);
   DCHECK_EQ(1u, erased);
 }
 
 }  // namespace content