Port messages sent by WebIDBFactoryImpl to Mojo.

third_party/WebKit/Source/modules/indexeddb/WebIDBDatabaseCallbacksImpl.cpp

Index: third_party/WebKit/Source/modules/indexeddb/WebIDBDatabaseCallbacksImpl.cpp
diff --git a/third_party/WebKit/Source/modules/indexeddb/WebIDBDatabaseCallbacksImpl.cpp b/third_party/WebKit/Source/modules/indexeddb/WebIDBDatabaseCallbacksImpl.cpp
index 4b6b8e87603ccf4e2b756924583d64539efe6c18..55dfd32ff01e2e88bcfc03c9c451a43c32512b2e 100644
--- a/third_party/WebKit/Source/modules/indexeddb/WebIDBDatabaseCallbacksImpl.cpp
+++ b/third_party/WebKit/Source/modules/indexeddb/WebIDBDatabaseCallbacksImpl.cpp
@@ -27,10 +27,22 @@
 
 #include "core/dom/DOMException.h"
 #include "wtf/PtrUtil.h"
+#include "wtf/ThreadSpecific.h"
 #include <memory>
 
 namespace blink {
 
+// This thread-specific list keeps track of instances of
+// WebIDBDatabaseCallbacksImpl created by each thread. If a thread exits
+// before they are destroyed then they would otherwise be leaked because the IO
+// thread can no longer post a task to the thread on which they were created.
+using CallbacksList = std::vector<std::unique_ptr<WebIDBDatabaseCallbacksImpl>>;
+static ThreadSpecific<CallbacksList>& outstandingCallbacks() {
+  DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<CallbacksList>, callbacks,
+                                  new ThreadSpecific<CallbacksList>);
+  return callbacks;
+}
+
 // static
 std::unique_ptr<WebIDBDatabaseCallbacksImpl>
 WebIDBDatabaseCallbacksImpl::create(IDBDatabaseCallbacks* callbacks) {
@@ -39,27 +51,52 @@ WebIDBDatabaseCallbacksImpl::create(IDBDatabaseCallbacks* callbacks) {
 
 WebIDBDatabaseCallbacksImpl::WebIDBDatabaseCallbacksImpl(
     IDBDatabaseCallbacks* callbacks)
-    : m_callbacks(callbacks) {}
+    : m_callbacks(callbacks) {
+  outstandingCallbacks()->push_back(wrapUnique(this));
+}
 
-WebIDBDatabaseCallbacksImpl::~WebIDBDatabaseCallbacksImpl() {}
+WebIDBDatabaseCallbacksImpl::~WebIDBDatabaseCallbacksImpl() {
+  if (m_callbacks)
+    m_callbacks->webCallbacksDestroyed();
+
+  CallbacksList& callbacks = *outstandingCallbacks();
+  auto it = std::find_if(
+      callbacks.begin(), callbacks.end(),
+      [this](const std::unique_ptr<WebIDBDatabaseCallbacksImpl>& element) {
+        return element.get() == this;
+      });
+  if (it != callbacks.end()) {
+    it->release();
+    callbacks.erase(it);
+  }
+}
 
 void WebIDBDatabaseCallbacksImpl::onForcedClose() {
-  m_callbacks->onForcedClose();
+  if (m_callbacks)
+    m_callbacks->onForcedClose();
 }
 
 void WebIDBDatabaseCallbacksImpl::onVersionChange(long long oldVersion,
                                                   long long newVersion) {
-  m_callbacks->onVersionChange(oldVersion, newVersion);
+  if (m_callbacks)
+    m_callbacks->onVersionChange(oldVersion, newVersion);
 }
 
 void WebIDBDatabaseCallbacksImpl::onAbort(long long transactionId,
                                           const WebIDBDatabaseError& error) {
-  m_callbacks->onAbort(transactionId,
-                       DOMException::create(error.code(), error.message()));
+  if (m_callbacks) {
+    m_callbacks->onAbort(transactionId,
+                         DOMException::create(error.code(), error.message()));
+  }
 }
 
 void WebIDBDatabaseCallbacksImpl::onComplete(long long transactionId) {
-  m_callbacks->onComplete(transactionId);
+  if (m_callbacks)
+    m_callbacks->onComplete(transactionId);
+}
+
+void WebIDBDatabaseCallbacksImpl::detach() {
+  m_callbacks.clear();
 }
 
 }  // namespace blink