Leak Detector: Add support for ScriptPromise on Blink side

Source/bindings/core/v8/ScriptPromise.cpp

Index: Source/bindings/core/v8/ScriptPromise.cpp
diff --git a/Source/bindings/core/v8/ScriptPromise.cpp b/Source/bindings/core/v8/ScriptPromise.cpp
index d04f450bec5dca028705e54ad7bd9f935ff75e5b..19bc971781f847adce99edf911871c38f5a1e7d5 100644
--- a/Source/bindings/core/v8/ScriptPromise.cpp
+++ b/Source/bindings/core/v8/ScriptPromise.cpp
@@ -52,6 +52,8 @@ struct WithScriptState {
 
 } // namespace
 
+unsigned ScriptPromise::s_instanceCount = 0;
+
 ScriptPromise::InternalResolver::InternalResolver(ScriptState* scriptState)
     : m_resolver(scriptState, v8::Promise::Resolver::New(scriptState->context())) { }
 
@@ -85,9 +87,16 @@ void ScriptPromise::InternalResolver::reject(v8::Local<v8::Value> value)
     clear();
 }
 
+ScriptPromise::ScriptPromise()
+{
+    ++s_instanceCount;
+}
+
 ScriptPromise::ScriptPromise(ScriptState* scriptState, v8::Local<v8::Value> value)
     : m_scriptState(scriptState)
 {
+    ++s_instanceCount;
+
     if (value.IsEmpty())
         return;
 
@@ -99,6 +108,19 @@ ScriptPromise::ScriptPromise(ScriptState* scriptState, v8::Local<v8::Value> valu
     m_promise = ScriptValue(scriptState, value);
 }
 
+ScriptPromise::ScriptPromise(const ScriptPromise& other)
+{
+    ++s_instanceCount;
+
+    this->m_scriptState = other.m_scriptState;
+    this->m_promise = other.m_promise;
+}
+
+ScriptPromise::~ScriptPromise()
+{
+    --s_instanceCount;
+}
+
 ScriptPromise ScriptPromise::then(v8::Local<v8::Function> onFulfilled, v8::Local<v8::Function> onRejected)
 {
     if (m_promise.isEmpty())