Add PepperTryCatch and V8ObjectVar classes

content/renderer/pepper/pepper_plugin_instance_impl.h

Index: content/renderer/pepper/pepper_plugin_instance_impl.h
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.h b/content/renderer/pepper/pepper_plugin_instance_impl.h
index ee66136bd4a0d76f24573849ca4ffe006c654f75..4b86e6e67c2eb6af8a76fbc077e6ba8be9674188 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.h
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.h
@@ -59,6 +59,7 @@
 #include "ui/events/latency_info.h"
 #include "ui/gfx/rect.h"
 #include "url/gurl.h"
+#include "v8/include/v8.h"
 
 struct PP_Point;
 struct _NPP;
@@ -94,10 +95,6 @@ struct PPP_Instance_Combined;
 class ScopedPPVar;
 }
 
-namespace v8 {
-class Isolate;
-}
-
 namespace content {
 
 class ContentDecryptorDelegate;
@@ -146,6 +143,9 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
     return *resource_creation_.get();
   }
 
+  // Return the v8 context that the plugin is in.
+  v8::Local<v8::Context> GetContext();
+
   // 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