Implement PPAPI VideoDecode out-of-process support

ppapi/shared_impl/tracker_base.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_SHARED_IMPL_TRACKER_BASE_H_
 #define PPAPI_SHARED_IMPL_TRACKER_BASE_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/proxy/interface_id.h"
 
 namespace ppapi {
 
 class FunctionGroupBase;
 class ResourceObjectBase;
 class Var;
 
 // Tracks resource and function APIs, providing a mapping between ID and
 // object.
 // TODO(brettw) Eventually this should be one object with global tracking and
 // called "Tracker", and this would be used in both the plugin side of the
 // proxy as well as the implementation in the renderer. Currently, all this
 // does is forward to the process-type-specific tracker to get the information.
+// TODO(fischman/vrk): When brettw fixes the TODO above, fix the ugliness in
+// VideoDecoderImpl accordingly.
 class TrackerBase {
  public:
   // Must be called before any other function that uses the TrackerBase.
   // This sets the getter that returns the global implmenetation of
   // TrackerBase. It will be different for in the renderer and in the plugin
   // process.
   static void Init(TrackerBase*(*getter)());
 
   // Retrieves the global tracker. This will be NULL if you haven't called
   // Init() first (it should be unnecessary to NULL-check this).
@@ skipping 20 matching lines @@
   // Retrieves a var from the tracker, returning an empty scoped ptr on failure.
   virtual scoped_refptr<Var> GetVar(int32 var_id) const = 0;
 
   virtual bool AddRefVar(int32 var_id) = 0;
   virtual bool UnrefVar(int32 var_id) = 0;
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_TRACKER_BASE_H_