[Android] Cache function templates in GinJavaBridgeObject to avoid memory leak

content/renderer/java/gin_java_bridge_object.h

 // Copyright 2014 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_JAVA_GIN_JAVA_BRIDGE_OBJECT_H_
 #define CONTENT_RENDERER_JAVA_GIN_JAVA_BRIDGE_OBJECT_H_
 
 #include <map>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "content/renderer/java/gin_java_bridge_dispatcher.h"
 #include "gin/handle.h"
 #include "gin/interceptor.h"
 #include "gin/object_template_builder.h"
 #include "gin/wrappable.h"
+#include "v8/include/v8-util.h"
 
 namespace blink {
 class WebFrame;
 }
 
 namespace content {
 
 class GinJavaBridgeValueConverter;
 
 class GinJavaBridgeObject : public gin::Wrappable<GinJavaBridgeObject>,
@@ skipping 21 matching lines @@
   static GinJavaBridgeObject* InjectAnonymous(
       const base::WeakPtr<GinJavaBridgeDispatcher>& dispatcher,
       GinJavaBridgeDispatcher::ObjectID object_id);
 
  private:
   GinJavaBridgeObject(v8::Isolate* isolate,
                       const base::WeakPtr<GinJavaBridgeDispatcher>& dispatcher,
                       GinJavaBridgeDispatcher::ObjectID object_id);
   ~GinJavaBridgeObject() override;
 
+  v8::Local<v8::FunctionTemplate> GetFunctionTemplate(v8::Isolate* isolate,
+                                                      const std::string& name);
   v8::Handle<v8::Value> InvokeMethod(const std::string& name,
                                      gin::Arguments* args);
 
   base::WeakPtr<GinJavaBridgeDispatcher> dispatcher_;
   GinJavaBridgeDispatcher::ObjectID object_id_;
   scoped_ptr<GinJavaBridgeValueConverter> converter_;
   std::map<std::string, bool> known_methods_;
+  v8::StdPersistentValueMap<std::string, v8::FunctionTemplate> template_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(GinJavaBridgeObject);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_JAVA_GIN_JAVA_BRIDGE_OBJECT_H_