Make it possible to have 1 PpapiGlobals per thread. Update unit tests.

ppapi/proxy/plugin_globals.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_PROXY_PLUGIN_GLOBALS_H_
 #define PPAPI_PROXY_PLUGIN_GLOBALS_H_
 
 #include "base/compiler_specific.h"
+#include "base/synchronization/lock.h"
 #include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
 #include "ppapi/shared_impl/callback_tracker.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
 
 namespace ppapi {
 namespace proxy {
 
 class PluginProxyDelegate;
 
 class PPAPI_PROXY_EXPORT PluginGlobals : public PpapiGlobals {
  public:
   PluginGlobals();
+  PluginGlobals(PpapiGlobals::ForTest);
   virtual ~PluginGlobals();
 
   // Getter for the global singleton. Generally, you should use
   // PpapiGlobals::Get() when possible. Use this only when you need some
   // plugin-specific functionality.
-  inline static PluginGlobals* Get() { return plugin_globals_; }
+  inline static PluginGlobals* Get() {
+    DCHECK(PpapiGlobals::Get()->IsPluginGlobals());
+    return static_cast<PluginGlobals*>(PpapiGlobals::Get());
+  }
 
   // PpapiGlobals implementation.
   virtual ResourceTracker* GetResourceTracker() OVERRIDE;
   virtual VarTracker* GetVarTracker() OVERRIDE;
   virtual CallbackTracker* GetCallbackTrackerForInstance(
       PP_Instance instance) OVERRIDE;
   virtual FunctionGroupBase* GetFunctionAPI(PP_Instance inst,
                                             ApiID id) OVERRIDE;
   virtual PP_Module GetModuleForInstance(PP_Instance instance) OVERRIDE;
+  virtual base::Lock* GetProxyLock() OVERRIDE;
 
   // Getters for the plugin-specific versions.
   PluginResourceTracker* plugin_resource_tracker() {
     return &plugin_resource_tracker_;
   }
   PluginVarTracker* plugin_var_tracker() {
     return &plugin_var_tracker_;
   }
 
   // The embedder should call set_proxy_delegate during startup.
   PluginProxyDelegate* plugin_proxy_delegate() {
     return plugin_proxy_delegate_;
   }
   void set_plugin_proxy_delegate(PluginProxyDelegate* d) {
     plugin_proxy_delegate_ = d;
   }
 
  private:
+  // PpapiGlobals overrides.
+  virtual bool IsPluginGlobals() const OVERRIDE;
+
   static PluginGlobals* plugin_globals_;
 
   PluginProxyDelegate* plugin_proxy_delegate_;
   PluginResourceTracker plugin_resource_tracker_;
   PluginVarTracker plugin_var_tracker_;
   scoped_refptr<CallbackTracker> callback_tracker_;
+  base::Lock proxy_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginGlobals);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif   // PPAPI_PROXY_PLUGIN_GLOBALS_H_