[Experimental] Supporting OOPIF printing

content/browser/utility_process_host_impl.cc

Index: content/browser/utility_process_host_impl.cc
diff --git a/content/browser/utility_process_host_impl.cc b/content/browser/utility_process_host_impl.cc
index fd057ba52a843d9bc6b27335dee2700e1bd3814a..aa68aac5e21b9d1706f0d1c068397bd714eae21c 100644
--- a/content/browser/utility_process_host_impl.cc
+++ b/content/browser/utility_process_host_impl.cc
@@ -22,7 +22,9 @@
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
 #include "build/build_config.h"
+#include "components/discardable_memory/service/discardable_shared_memory_manager.h"
 #include "content/browser/browser_child_process_host_impl.h"
+#include "content/browser/browser_main_loop.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/service_manager/service_manager_context.h"
 #include "content/common/child_process_host_impl.h"
@@ -32,6 +34,7 @@
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/utility_process_host_client.h"
+#include "content/public/common/connection_filter.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/mojo_channel_switches.h"
 #include "content/public/common/process_type.h"
@@ -135,6 +138,28 @@ class UtilitySandboxedProcessLauncherDelegate
 
 UtilityMainThreadFactoryFunction g_utility_main_thread_factory = NULL;
 
+class UtilityProcessHost::ConnectionFilterImpl : public ConnectionFilter {
+ public:
+  ConnectionFilterImpl() {}
+
+ private:
+  // ConnectionFilter:
+  bool OnConnect(const service_manager::Identity& remote_identity,
+                 service_manager::InterfaceRegistry* registry,
+                 service_manager::Connector* connector) override {
+    if (BrowserMainLoop::GetInstance()) {
+      discardable_memory::DiscardableSharedMemoryManager* manager =
+          BrowserMainLoop::GetInstance()->discardable_shared_memory_manager();
+      registry->AddInterface(
+          base::Bind(&discardable_memory::DiscardableSharedMemoryManager::Bind,
+                     base::Unretained(manager)));
+    }
+    return true;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(ConnectionFilterImpl);
+};
+
 UtilityProcessHost* UtilityProcessHost::Create(
     const scoped_refptr<UtilityProcessHostClient>& client,
     const scoped_refptr<base::SequencedTaskRunner>& client_task_runner) {
@@ -232,6 +257,14 @@ UtilityProcessHostImpl::GetRemoteInterfaces() {
   return process_->child_connection()->GetRemoteInterfaces();
 }
 
+void UtilityProcessHostImpl::RegisterMojoServices() {
+  // May be null during test execution.
+  if (ServiceManagerConnection::GetForProcess()) {
+    ServiceManagerConnection::GetForProcess()->AddConnectionFilter(
+        base::MakeUnique<ConnectionFilterImpl>());
+  }
+}
+
 void UtilityProcessHostImpl::SetName(const base::string16& name) {
   name_ = name;
 }