Add PepperTryCatch and V8ObjectVar classes

content/renderer/pepper/pepper_plugin_instance_impl.cc

 // 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.
 
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 643 matching lines @@
   // want to look up in the global map to get info off of our object.
   HostGlobals::Get()->InstanceDeleted(pp_instance_);
 }
 
 // NOTE: Any of these methods that calls into the plugin needs to take into
 // account that the plugin may use Var to remove the <embed> from the DOM, which
 // will make the PepperWebPluginImpl drop its reference, usually the last one.
 // If a method needs to access a member of the instance after the call has
 // returned, then it needs to keep its own reference on the stack.
 
+v8::Local<v8::Context> PepperPluginInstanceImpl::GetContext() {
+  if (!container_)
+    return v8::Handle<v8::Context>();
+  v8::Handle<v8::Context> context =
+      container_->element().document().frame()->mainWorldScriptContext();

[dmichael (off chromium), 2014/07/30 19:34:13]

The frame can be NULL in rare cases, so please check that and return a null
Context in that case.

[raymes, 2014/08/06 03:22:52]

Done.

+  DCHECK(context->GetIsolate() == isolate_);
+  return context;
+}
+
 void PepperPluginInstanceImpl::Delete() {
   is_deleted_ = true;
 
   if (render_frame_ &&
       render_frame_->render_view()->plugin_find_handler() == this) {
     render_frame_->render_view()->set_plugin_find_handler(NULL);
   }
 
   // Keep a reference on the stack. See NOTE above.
   scoped_refptr<PepperPluginInstanceImpl> ref(this);
@@ skipping 2632 matching lines @@
     // Running out-of-process. Initiate an IPC call to notify the plugin
     // process.
     ppapi::proxy::HostDispatcher* dispatcher =
         ppapi::proxy::HostDispatcher::GetForInstance(pp_instance());
     dispatcher->Send(new PpapiMsg_PPPInstance_HandleDocumentLoad(
         ppapi::API_ID_PPP_INSTANCE, pp_instance(), pending_host_id, data));
   }
 }
 
 }  // namespace content