[Extensions] Add renderer-side logic to short circuit activity logging

extensions/renderer/api_activity_logger.cc

 // 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.
 
 #include <stddef.h>
 
 #include <string>
 
 #include "base/bind.h"
 #include "content/public/child/v8_value_converter.h"
 #include "content/public/renderer/render_thread.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/renderer/activity_log_converter_strategy.h"
 #include "extensions/renderer/api_activity_logger.h"
+#include "extensions/renderer/dispatcher.h"
 #include "extensions/renderer/script_context.h"
 
 using content::V8ValueConverter;
 
 namespace extensions {
 
-APIActivityLogger::APIActivityLogger(ScriptContext* context)
-    : ObjectBackedNativeHandler(context) {
-  RouteFunction("LogEvent", base::Bind(&APIActivityLogger::LogEvent));
-  RouteFunction("LogAPICall", base::Bind(&APIActivityLogger::LogAPICall));
+APIActivityLogger::APIActivityLogger(ScriptContext* context,
+                                     Dispatcher* dispatcher)
+    : ObjectBackedNativeHandler(context), dispatcher_(dispatcher) {
+  RouteFunction("LogEvent", base::Bind(&APIActivityLogger::LogEvent,
+                                       base::Unretained(this)));
+  RouteFunction("LogAPICall", base::Bind(&APIActivityLogger::LogAPICall,
+                                         base::Unretained(this)));
 }
 
+APIActivityLogger::~APIActivityLogger() {}
+
 // static
 void APIActivityLogger::LogAPICall(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   LogInternal(APICALL, args);
 }
 
 // static
 void APIActivityLogger::LogEvent(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   LogInternal(EVENT, args);
 }
 
 // static
 void APIActivityLogger::LogInternal(
     const CallType call_type,
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   CHECK_GT(args.Length(), 2);
   CHECK(args[0]->IsString());
   CHECK(args[1]->IsString());
   CHECK(args[2]->IsArray());
 
+  if (!dispatcher_->activity_logging_enabled())
+    return;
+
   std::string ext_id = *v8::String::Utf8Value(args[0]);
   ExtensionHostMsg_APIActionOrEvent_Params params;
   params.api_call = *v8::String::Utf8Value(args[1]);
   if (args.Length() == 4)  // Extras are optional.
     params.extra = *v8::String::Utf8Value(args[3]);
   else
     params.extra = "";
 
   // Get the array of api call arguments.
   v8::Local<v8::Array> arg_array = v8::Local<v8::Array>::Cast(args[2]);
@@ skipping 15 matching lines @@
   if (call_type == APICALL) {
     content::RenderThread::Get()->Send(
         new ExtensionHostMsg_AddAPIActionToActivityLog(ext_id, params));
   } else if (call_type == EVENT) {
     content::RenderThread::Get()->Send(
         new ExtensionHostMsg_AddEventToActivityLog(ext_id, params));
   }
 }
 
 }  // namespace extensions