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

content/public/test/render_view_test.cc

Index: content/public/test/render_view_test.cc
diff --git a/content/public/test/render_view_test.cc b/content/public/test/render_view_test.cc
index 642d4277cb2e5d6796dc1b94fb6b3e05efb3d27d..cd641a41b5f814ace1bd016ef13dff9abc60efb5 100644
--- a/content/public/test/render_view_test.cc
+++ b/content/public/test/render_view_test.cc
@@ -172,7 +172,8 @@ class RendererBlinkPlatformImplTestOverrideImpl
  public:
   RendererBlinkPlatformImplTestOverrideImpl(
       scheduler::RendererScheduler* scheduler)
-      : RendererBlinkPlatformImpl(scheduler) {}
+      : RendererBlinkPlatformImpl(scheduler, base::WeakPtr<ServiceRegistry>()) {

[sky, 2016/04/05 16:54:13]

I'm surprised nullptr doesn't work here.

[Sam McNally, 2016/04/06 01:32:53]

It does now :)

+  }
 
   // Get rid of the dependency to the sandbox, which is not available in
   // RenderViewTest.