[inspector] introduce limit for amount of stored async stacks

src/inspector/v8-debugger.h

Index: src/inspector/v8-debugger.h
diff --git a/src/inspector/v8-debugger.h b/src/inspector/v8-debugger.h
index b1c044a06906f986bed52cfee54e12798f38809e..ab663a3f3027249a61b55a6429c154505bb5f893 100644
--- a/src/inspector/v8-debugger.h
+++ b/src/inspector/v8-debugger.h
@@ -5,6 +5,7 @@
 #ifndef V8_INSPECTOR_V8DEBUGGER_H_
 #define V8_INSPECTOR_V8DEBUGGER_H_
 
+#include <deque>
 #include <vector>
 
 #include "src/base/macros.h"
@@ -135,6 +136,7 @@ class V8Debugger {
                                            v8::Local<v8::Function>);
   v8::MaybeLocal<v8::Value> generatorScopes(v8::Local<v8::Context>,
                                             v8::Local<v8::Value>);
+  void cleanupScheduledOrderIfNeeded();
 
   v8::Isolate* m_isolate;
   V8InspectorImpl* m_inspector;
@@ -150,6 +152,8 @@ class V8Debugger {
   using AsyncTaskToStackTrace =
       protocol::HashMap<void*, std::unique_ptr<V8StackTraceImpl>>;
   AsyncTaskToStackTrace m_asyncTaskStacks;
+  std::deque<void*> m_scheduledOrder;

[dgozman, 2016/12/16 22:36:11]

Can we instead have two maps: void* -> task_id, and task_id -> void* ?
Then we can increment the id, and just use idToTask.front(). WDYT?

[kozy, 2016/12/16 22:56:15]

Done.

+  std::unordered_set<void*> m_scheduledOrderDeleted;
   protocol::HashSet<void*> m_recurringTasks;
   int m_maxAsyncCallStackDepth;
   std::vector<void*> m_currentTasks;