mediaview: Mount ARC documents provider file system volumes.

components/arc/arc_service_manager.h

Index: components/arc/arc_service_manager.h
diff --git a/components/arc/arc_service_manager.h b/components/arc/arc_service_manager.h
index 81a4ea9e98b2e715e289b112d3cae2660d72cbd6..bba756e46654ffc2ca6babdc4579cdf19551293f 100644
--- a/components/arc/arc_service_manager.h
+++ b/components/arc/arc_service_manager.h
@@ -19,6 +19,7 @@
 namespace arc {
 
 class ArcBridgeService;
+class ArcFileSystemService;
 class ArcIntentHelperObserver;
 class ArcService;
 
@@ -31,10 +32,10 @@ class ArcServiceManager {
     // Called when ArcServiceManager is being shut down. Observer
     // implementation should clean up ARC related stuff here. One of the
     // typical use cases is calling ArcServiceManager::RemoveObserver().
-    virtual void OnArcShutdown() = 0;
+    virtual void OnArcShutdown() {}

[Luis Héctor Chávez, 2017/01/10 18:51:35]

nit: can you leave them as they were before? we want people to try not to use
it, and having them all as = 0 introduces a desirable amount of friction.

[Shuhei Takahashi, 2017/01/11 15:20:43]

Done.

 
     // Called when intent filters are added or removed.
-    virtual void OnIntentFiltersUpdated() = 0;
+    virtual void OnIntentFiltersUpdated() {}
 
    protected:
     virtual ~Observer() = default;
@@ -73,11 +74,19 @@ class ArcServiceManager {
     return activity_resolver_;
   }
 
-  // Returns the IntentHelperObserver instance owned by ArcServiceManager.
+  // Returns the ArcIntentHelperObserver instance owned by ArcServiceManager.
   ArcIntentHelperObserver* intent_helper_observer() {
     return intent_helper_observer_.get();
   }
 
+  // TODO(crbug.com/672840): Implement a generic getter to avoid boilerplates.
+  void set_file_system_service(ArcFileSystemService* file_system_service) {
+    file_system_service_ = file_system_service;
+  }
+  ArcFileSystemService* file_system_service() const {
+    return file_system_service_;
+  }
+
  private:
   class IntentHelperObserverImpl;  // implemented in arc_service_manager.cc.
 
@@ -92,6 +101,8 @@ class ArcServiceManager {
   scoped_refptr<ActivityIconLoader> icon_loader_;
   scoped_refptr<LocalActivityResolver> activity_resolver_;
 
+  ArcFileSystemService* file_system_service_;  // Owned by |services_|.
+
   base::ObserverList<Observer> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcServiceManager);