Use the correct v8 context for conversions when calling into the plugin from JS

content/renderer/pepper/pepper_plugin_instance_impl.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 CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 131 matching lines @@
   ppapi::thunk::ResourceCreationAPI& resource_creation() {
     return *resource_creation_.get();
   }
 
   MessageChannel* message_channel() { return message_channel_; }
   v8::Local<v8::Object> GetMessageChannelObject();
   // Called when |message_channel_| is destroyed as it may be destroyed prior to
   // the plugin being destroyed.
   void MessageChannelDestroyed();
 
-  // Return the v8 context that the plugin is in.
-  v8::Local<v8::Context> GetContext();
+  // Return the v8 context for the frame that the plugin is contained in. Care
+  // should be taken to use the correct context for plugin<->JS interactions.
+  // In cases where JS calls into the plugin, the caller's context should
+  // typically be used. When calling from the plugin into JS, this context
+  // should typically used.
+  v8::Local<v8::Context> GetMainWorldContext();
 
   // Does some pre-destructor cleanup on the instance. This is necessary
   // because some cleanup depends on the plugin instance still existing (like
   // calling the plugin's DidDestroy function). This function is called from
   // the WebPlugin implementation when WebKit is about to remove the plugin.
   void Delete();
 
   // Returns true if Delete() has been called on this object.
   bool is_deleted() const;
 
@@ skipping 759 matching lines @@
   base::WeakPtrFactory<PepperPluginInstanceImpl> view_change_weak_ptr_factory_;
   base::WeakPtrFactory<PepperPluginInstanceImpl> weak_factory_;
 
   friend class PpapiPluginInstanceTest;
   DISALLOW_COPY_AND_ASSIGN(PepperPluginInstanceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_INSTANCE_IMPL_H_