File constructor understands lastModified.

Source/bindings/v8/custom/V8FileCustom.cpp

Index: Source/bindings/v8/custom/V8FileCustom.cpp
diff --git a/Source/bindings/v8/custom/V8FileCustom.cpp b/Source/bindings/v8/custom/V8FileCustom.cpp
index 6983ef2188946414cbbeb6a688c5b9914d1d3b51..6f82f5141464c0e74650c12eefc3560a6bacfb6e 100644
--- a/Source/bindings/v8/custom/V8FileCustom.cpp
+++ b/Source/bindings/v8/custom/V8FileCustom.cpp
@@ -62,25 +62,49 @@ void V8File::constructorCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, fileName, info[1]);
 
-    String contentType;
-    String endings = "transparent"; // default if no BlobPropertyBag is passed
+    V8BlobCustomHelpers::ParsedProperties properties(true);
     if (info.Length() > 2) {
         if (!info[2]->IsObject()) {
             throwTypeError(ExceptionMessages::failedToConstruct("File", "The 3rd argument is not of type Object."), info.GetIsolate());
             return;
         }
 
-        if (!V8BlobCustomHelpers::processBlobPropertyBag(info[2], "File", contentType, endings, info.GetIsolate()))
+        if (!properties.parseBlobPropertyBag(info[2], "File", info.GetIsolate()))
             return;
+    } else {
+        properties.setDefaultLastModified();
     }
 
     BlobBuilder blobBuilder;
     v8::Local<v8::Object> blobParts = v8::Local<v8::Object>::Cast(info[0]);
-    if (!V8BlobCustomHelpers::processBlobParts(blobParts, length, endings, blobBuilder, info.GetIsolate()))
+    if (!V8BlobCustomHelpers::processBlobParts(blobParts, length, properties.endings(), blobBuilder, info.GetIsolate()))
         return;
 
-    RefPtr<File> file = blobBuilder.createFile(contentType, fileName, currentTime());
+    RefPtr<File> file = blobBuilder.createFile(properties.contentType(), fileName, properties.lastModified());
     v8SetReturnValue(info, file.release());
 }
 
+void V8File::lastModifiedDateAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    // The auto-generated getters return null when the method in the underlying
+    // implementation returns NaN. The File API says we should return the
+    // current time when the last modification time is unknown.
+    // Section 7.2 of the File API spec. http://dev.w3.org/2006/webapi/FileAPI/
+
+    File* file = V8File::toNative(info.Holder());
+    double lastModified = file->lastModifiedDate();
+    if (!isValidFileTime(lastModified))
+        lastModified = currentTimeMS();
+    v8SetReturnValue(info, v8::Date::New(lastModified));
+}
+
+void V8File::lastModifiedAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    File* file = V8File::toNative(info.Holder());
+    double lastModified = file->lastModifiedDate();
+    if (!isValidFileTime(lastModified))
+        lastModified = currentTimeMS();
+    v8SetReturnValue(info, floor(lastModified));
+}
+
 } // namespace WebCore