[Work In Progress] Use worker context provider in SurfaceBinding

mandoline/ui/aura/surface_binding.cc

Index: mandoline/ui/aura/surface_binding.cc
diff --git a/mandoline/ui/aura/surface_binding.cc b/mandoline/ui/aura/surface_binding.cc
index f610fed0f658132d6d35602d1ccf676d9b91d5c3..43beb2c23496892322b3e12700d897a411271fb6 100644
--- a/mandoline/ui/aura/surface_binding.cc
+++ b/mandoline/ui/aura/surface_binding.cc
@@ -34,11 +34,13 @@ namespace {
 // appropriate.
 class OutputSurfaceImpl : public cc::OutputSurface {
  public:
-  OutputSurfaceImpl(mojo::View* view,
-                    const scoped_refptr<cc::ContextProvider>& context_provider,
-                    mojo::Surface* surface,
-                    uint32_t id_namespace,
-                    uint32_t* next_local_id);
+  OutputSurfaceImpl(
+      mojo::View* view,
+      const scoped_refptr<cc::ContextProvider>& context_provider,
+      const scoped_refptr<cc::ContextProvider>& worker_context_provider,
+      mojo::Surface* surface,
+      uint32_t id_namespace,
+      uint32_t* next_local_id);
   ~OutputSurfaceImpl() override;
 
   // cc::OutputSurface:
@@ -58,10 +60,11 @@ class OutputSurfaceImpl : public cc::OutputSurface {
 OutputSurfaceImpl::OutputSurfaceImpl(
     mojo::View* view,
     const scoped_refptr<cc::ContextProvider>& context_provider,
+    const scoped_refptr<cc::ContextProvider>& worker_context_provider,
     mojo::Surface* surface,
     uint32_t id_namespace,
     uint32_t* next_local_id)
-    : cc::OutputSurface(context_provider),
+    : cc::OutputSurface(context_provider, worker_context_provider),
       view_(view),
       surface_(surface),
       id_namespace_(id_namespace),
@@ -172,11 +175,16 @@ SurfaceBinding::PerViewManagerState::CreateOutputSurface(mojo::View* view) {
   // TODO(sky): figure out lifetime here. Do I need to worry about the return
   // value outliving this?
   mojo::CommandBufferPtr cb;
+  mojo::CommandBufferPtr worker_cb;
   gpu_->CreateOffscreenGLES2Context(GetProxy(&cb));
+  gpu_->CreateOffscreenGLES2Context(GetProxy(&worker_cb));
   scoped_refptr<cc::ContextProvider> context_provider(
       new mojo::ContextProviderMojo(cb.PassInterface().PassHandle()));
+  scoped_refptr<cc::ContextProvider> worker_context_provider(
+      new mojo::ContextProviderMojo(worker_cb.PassInterface().PassHandle()));
   return make_scoped_ptr(new OutputSurfaceImpl(
-      view, context_provider, surface_.get(), id_namespace_, &next_local_id_));
+      view, context_provider, worker_context_provider, surface_.get(),
+      id_namespace_, &next_local_id_));
 }
 
 SurfaceBinding::PerViewManagerState::PerViewManagerState(