Add glue for supporting custom MIME types in DataTransfer.

webkit/glue/webdropdata.cc

Index: webkit/glue/webdropdata.cc
diff --git a/webkit/glue/webdropdata.cc b/webkit/glue/webdropdata.cc
index 0a06ac31be90f2a2c5bd9461f0dba5843531e328..bdfa77a79554fd9f404bc5ecd2fd69307e0321b6 100644
--- a/webkit/glue/webdropdata.cc
+++ b/webkit/glue/webdropdata.cc
@@ -4,6 +4,8 @@
 
 #include "webkit/glue/webdropdata.h"
 
+#include <utility>
+
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebData.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragData.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebString.h"
@@ -33,6 +35,11 @@ WebDropData::WebDropData(const WebDragData& drag_data)
   WebData contents = drag_data.fileContent();
   if (!contents.isEmpty())
     file_contents.assign(contents.data(), contents.size());
+  WebVector<WebDragData::CustomData> custom_data_copy = drag_data.customData();
+  for (size_t i = 0; i < custom_data_copy.size(); ++i) {
+    custom_data.insert(std::make_pair(custom_data_copy[i].m_type,
+                                      custom_data_copy[i].m_data));
+  }
 }
 
 WebDropData::WebDropData() {
@@ -53,5 +60,13 @@ WebDragData WebDropData::ToDragData() const {
   result.setHTMLBaseURL(html_base_url);
   result.setFileContentFilename(file_description_filename);
   result.setFileContent(WebData(file_contents.data(), file_contents.size()));
+  WebVector<WebDragData::CustomData> custom_data_vector(custom_data.size());
+  size_t i = 0;
+  for (std::map<string16, string16>::const_iterator it = custom_data.begin();
+       it != custom_data.end();
+       ++it, ++i) {
+    WebDragData::CustomData data = {it->first, it->second};
+    custom_data_vector[i] = data;
+  }
   return result;
 }