Implement FormData::isSafeToSendToAnotherThread()

Source/platform/network/FormData.cpp

Index: Source/platform/network/FormData.cpp
diff --git a/Source/platform/network/FormData.cpp b/Source/platform/network/FormData.cpp
index 29c655aba4176a3236a04312d86fa7a0c43ca46a..0d329416c0002c32963a8a33fc10693387aa685a 100644
--- a/Source/platform/network/FormData.cpp
+++ b/Source/platform/network/FormData.cpp
@@ -29,6 +29,13 @@
 
 namespace blink {
 
+bool FormDataElement::isSafeToSendToAnotherThread() const
+{
+    return m_filename.isSafeToSendToAnotherThread()
+        && m_blobUUID.isSafeToSendToAnotherThread()
+        && m_fileSystemURL.isSafeToSendToAnotherThread();
+}
+
 inline FormData::FormData()
     : m_identifier(0)
     , m_containsPasswordData(false)
@@ -187,4 +194,16 @@ unsigned long long FormData::sizeInBytes() const
     return size;
 }
 
+bool FormData::isSafeToSendToAnotherThread() const
+{
+    if (!hasOneRef())
+        return false;
+    size_t n = m_elements.size();
+    for (size_t i = 0; i < n; ++i) {

[haraken, 2015/08/11 10:58:45]

  for (auto element : m_elements)

would be better. [i] has an overhead of RELEASE_ASSERT for an index range check.

[hiroshige, 2015/08/11 11:20:28]

Done.
(I used "auto& element" instead of "auto element" to avoid implicit copy to
|element|)

+        if (!m_elements[i].isSafeToSendToAnotherThread())
+            return false;
+    }
+    return true;
+}
+
 } // namespace blink