[PPAPI] Add browser tests for compositor API

ppapi/proxy/plugin_dispatcher.h

 // Copyright (c) 2012 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_PROXY_PLUGIN_DISPATCHER_H_
 #define PPAPI_PROXY_PLUGIN_DISPATCHER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 44 matching lines @@
   typedef std::map<SingletonResourceID, scoped_refptr<Resource> >
       SingletonResourceMap;
   SingletonResourceMap singleton_resources;
 
   // Calls to |RequestSurroundingText()| are done by posted tasks. Track whether
   // a) a task is pending, to avoid redundant calls, and b) whether we should
   // actually call |RequestSurroundingText()|, to avoid stale calls (i.e.,
   // calling when we shouldn't).
   bool is_request_surrounding_text_pending;
   bool should_do_request_surrounding_text;
+
+  // The compositor bound to the instance.
+  scoped_refptr<Resource> bound_compositor;
 };
 
 class PPAPI_PROXY_EXPORT PluginDispatcher
     : public Dispatcher,
       public base::SupportsWeakPtr<PluginDispatcher> {
  public:
   class PPAPI_PROXY_EXPORT PluginDelegate : public ProxyChannel::Delegate {
    public:
     // Returns the set used for globally uniquifying PP_Instances. This same
     // set must be returned for all channels.
@@ skipping 126 matching lines @@
   // A filter for sending messages from threads other than the main thread.
   scoped_refptr<IPC::SyncMessageFilter> sync_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginDispatcher);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PLUGIN_DISPATCHER_H_