Serialize a subset of WebInputEvents to protobufs.

blimp/net/input_message_generator.h

Index: blimp/net/input_message_generator.h
diff --git a/blimp/net/input_message_generator.h b/blimp/net/input_message_generator.h
new file mode 100644
index 0000000000000000000000000000000000000000..87054709f18b9fc5ed8a1b01576a09a65c26605a
--- /dev/null
+++ b/blimp/net/input_message_generator.h
@@ -0,0 +1,40 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BLIMP_NET_INPUT_MESSAGE_GENERATOR_H_
+#define BLIMP_NET_INPUT_MESSAGE_GENERATOR_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "blimp/net/blimp_net_export.h"
+
+namespace blink {
+class WebInputEvent;
+}
+
+namespace blimp {
+
+class InputMessage;
+
+// Handles creating serialized InputMessage protos from a stream of
+// WebInputEvents.  This class may be stateful to optimize the size of the
+// serialized transmission data.  See InputMessageProcessor for the deserialize
+// code.
+class BLIMP_NET_EXPORT InputMessageGenerator {
+ public:
+  InputMessageGenerator();
+  ~InputMessageGenerator();
+
+  // Create an InputMessage that represents the WebInputEvent |event| and sends
+  // it to the |message_processor|.  This might make use of state from previous

[nyquist, 2015/11/24 08:12:43]

Where is |message_processor|?

[David Trainor- moved to gerrit, 2015/11/24 20:08:28]

Secret!

+  // messages.
+  bool GenerateMessage(const blink::WebInputEvent* event, InputMessage* proto);

[Wez, 2015/11/23 22:41:41]

nit: I think this should be const blink::WebInputEvent& - null input messages
don't make any sense.

Suggest returning scoped_ptr<InputMessage> - the MessageProcessor interface is
now passed the BlimpMessage to process, so creating a new message object at this
level doesn't really add any overhead.

[David Trainor- moved to gerrit, 2015/11/24 20:08:28]

Won't we have to copy the message into the BlimpMessage object we end up
sending?  I could return a scoped_ptr<BlimpMessage> object which would avoid
copying the proto though.

+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(InputMessageGenerator);
+};
+
+}  // namespace blimp
+
+#endif  // BLIMP_NET_INPUT_MESSAGE_GENERATOR_H_