Pass Surface ID namespace to renderer compositors.

content/browser/compositor/delegated_frame_host.cc

Index: content/browser/compositor/delegated_frame_host.cc
diff --git a/content/browser/compositor/delegated_frame_host.cc b/content/browser/compositor/delegated_frame_host.cc
index f45e7f40c1c3028defaba8746b6d81954ee7bd0f..0397b22bdea49c1da1f0babd5df6f3dace00c90d 100644
--- a/content/browser/compositor/delegated_frame_host.cc
+++ b/content/browser/compositor/delegated_frame_host.cc
@@ -65,7 +65,9 @@ DelegatedFrameHost::DelegatedFrameHost(DelegatedFrameHostClient* client)
       current_scale_factor_(1.f),
       can_lock_compositor_(YES_CAN_LOCK),
       delegated_frame_evictor_(new DelegatedFrameEvictor(this)) {
-  ImageTransportFactory::GetInstance()->AddObserver(this);
+  ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
+  factory->AddObserver(this);
+  id_allocator_ = factory->GetContextFactory()->CreateSurfaceIdAllocator();
 }
 
 void DelegatedFrameHost::WasShown(const ui::LatencyInfo& latency_info) {
@@ -195,6 +197,13 @@ void DelegatedFrameHost::EndFrameSubscription() {
   frame_subscriber_.reset();
 }
 
+uint32_t DelegatedFrameHost::GetSurfaceIdNamespace() {
+  if (!use_surfaces_)
+    return 0;
+
+  return id_allocator_->id_namespace();
+}
+
 bool DelegatedFrameHost::ShouldSkipFrame(gfx::Size size_in_dip) const {
   // Should skip a frame only when another frame from the renderer is guaranteed
   // to replace it. Otherwise may cause hangs when the renderer is waiting for
@@ -365,8 +374,6 @@ void DelegatedFrameHost::SwapDelegatedFrame(
       ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
       cc::SurfaceManager* manager = factory->GetSurfaceManager();
       if (!surface_factory_) {
-        id_allocator_ =
-            factory->GetContextFactory()->CreateSurfaceIdAllocator();
         surface_factory_ =
             make_scoped_ptr(new cc::SurfaceFactory(manager, this));
       }