Support event.clipboardData.types in layout tests.

webkit/tools/test_shell/mock_webclipboard_impl.cc

Index: webkit/tools/test_shell/mock_webclipboard_impl.cc
diff --git a/webkit/tools/test_shell/mock_webclipboard_impl.cc b/webkit/tools/test_shell/mock_webclipboard_impl.cc
index eec9099f34075ca163da1d9ea07b9335a8f39f92..eb006f0ff1c49d3c10e2fd6311711dbf2f8545bd 100644
--- a/webkit/tools/test_shell/mock_webclipboard_impl.cc
+++ b/webkit/tools/test_shell/mock_webclipboard_impl.cc
@@ -14,6 +14,7 @@
 
 using WebKit::WebString;
 using WebKit::WebURL;
+using WebKit::WebVector;
 
 bool MockWebClipboardImpl::isFormatAvailable(Format format, Buffer buffer) {
   switch (format) {
@@ -85,3 +86,17 @@ void MockWebClipboardImpl::writeImage(const WebKit::WebImage& image,
     m_writeSmartPaste = false;
   }
 }
+
+WebVector<WebString> MockWebClipboardImpl::readAvailableTypes(
+    Buffer buffer, bool* containsFilenames) {
+  *containsFilenames = false;
+  std::vector<WebString> results;
+  if (!m_plainText.isEmpty()) {
+    results.push_back(WebString("Text")); 
+    results.push_back(WebString("text/plain")); 
+  }
+  if (!m_htmlText.isEmpty()) {
+    results.push_back(WebString("text/html"));
+  }
+  return results;
+}