Pepper/Flapper: Add IsFormatAvailable() to PPB_Flash_Clipboard.

webkit/glue/webclipboard_impl.cc

Index: webkit/glue/webclipboard_impl.cc
diff --git a/webkit/glue/webclipboard_impl.cc b/webkit/glue/webclipboard_impl.cc
index 9eddb68bd46f68f9c84b2a7e5a64d29e1e567b32..10dddab7ddc4adc02dd59cf252ee0ef1611066fa 100644
--- a/webkit/glue/webclipboard_impl.cc
+++ b/webkit/glue/webclipboard_impl.cc
@@ -67,7 +67,15 @@ bool WebClipboardImpl::isFormatAvailable(Format format, Buffer buffer) {
   ui::Clipboard::FormatType format_type;
   ui::Clipboard::Buffer buffer_type;
 
+  if (!ConvertBufferType(buffer, &buffer_type))
+    return false;
+
   switch (format) {
+    case FormatPlainText:
+      return ClipboardIsFormatAvailable(ui::Clipboard::GetPlainTextFormatType(),
+                                        buffer_type) ||
+          ClipboardIsFormatAvailable(ui::Clipboard::GetPlainTextWFormatType(),
+                                     buffer_type);
     case FormatHTML:
       format_type = ui::Clipboard::GetHtmlFormatType();
       break;
@@ -84,9 +92,6 @@ bool WebClipboardImpl::isFormatAvailable(Format format, Buffer buffer) {
       return false;
   }
 
-  if (!ConvertBufferType(buffer, &buffer_type))
-    return false;
-
   return ClipboardIsFormatAvailable(format_type, buffer_type);
 }