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..394720c774c4a958673ae2f406eb7e0d5092f52a 100644
--- a/content/browser/compositor/delegated_frame_host.cc
+++ b/content/browser/compositor/delegated_frame_host.cc
@@ -195,6 +195,19 @@ void DelegatedFrameHost::EndFrameSubscription() {
   frame_subscriber_.reset();
 }
 
+uint32_t DelegatedFrameHost::GetSurfaceIdNamespace() {
+  if (!use_surfaces_)
+    return 0;
+
+  if (!surface_factory_) {
+    ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
+    cc::SurfaceManager* manager = factory->GetSurfaceManager();
+    id_allocator_ = factory->GetContextFactory()->CreateSurfaceIdAllocator();
+    surface_factory_ = make_scoped_ptr(new cc::SurfaceFactory(manager, this));
+  }
+  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
@@ -369,6 +382,8 @@ void DelegatedFrameHost::SwapDelegatedFrame(
             factory->GetContextFactory()->CreateSurfaceIdAllocator();
         surface_factory_ =
             make_scoped_ptr(new cc::SurfaceFactory(manager, this));
+        client_->DelegatedFrameHostUpdateSurfaceIdNamespace(

[jbauman, 2015/05/12 00:09:12]

Let's just create the id_allocator_ in the constructor, so we don't have to
worry about the namespace changing. It should be fine if multiple
SurfaceFactories have the same namespace as long as the ids they create don't
overlap.

[kenrb, 2015/05/12 20:01:41]

Done.

+            id_allocator_->id_namespace());
       }
       if (surface_id_.is_null() || frame_size != current_surface_size_ ||
           frame_size_in_dip != current_frame_size_in_dip_) {