Implement device enumeration for PPB_VideoCapture_Dev.

webkit/plugins/ppapi/mock_plugin_delegate.cc

Index: webkit/plugins/ppapi/mock_plugin_delegate.cc
diff --git a/webkit/plugins/ppapi/mock_plugin_delegate.cc b/webkit/plugins/ppapi/mock_plugin_delegate.cc
index 780bf4cb97c0b860c6c0b13636c64a043dbbc378..0c3169dd0b441b6186b68238b5f6ceb810ee3f9e 100644
--- a/webkit/plugins/ppapi/mock_plugin_delegate.cc
+++ b/webkit/plugins/ppapi/mock_plugin_delegate.cc
@@ -66,7 +66,8 @@ MockPluginDelegate::CreateVideoDecoder(
 
 MockPluginDelegate::PlatformVideoCapture*
 MockPluginDelegate::CreateVideoCapture(
-    media::VideoCapture::EventHandler* handler){
+    const std::string& device_id,
+    PlatformVideoCaptureEventHandler* handler){
   return NULL;
 }
 
@@ -378,5 +379,11 @@ bool MockPluginDelegate::IsPageVisible() const {
   return true;
 }
 
+int MockPluginDelegate::EnumerateDevices(
+    PP_DeviceType_Dev type,
+    const EnumerateDevicesCallback& callback) {
+  return -1;
+}
+
 }  // namespace ppapi
 }  // namespace webkit