cc/blimp: Proto Cleanup.

cc/proto/compositor_message_to_main.proto

-// Copyright 2016 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.
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-
-import "begin_main_frame_and_commit_state.proto";
-
-package cc.proto;
-
-// Control messages sent to the main side of the compositor(server) from the
-// impl side of the compositor(client).
-// TODO(khushalsagar): Are any more messages required? (See crbug.com/584078)
-message CompositorMessageToMain {
-  enum Type {
-    // The enum values which are unknown get mapped to the default value, which
-    // is zero. This can happen with when the protocol version is different on
-    // the client and server.
-    // Ignore the messages with type UNKNOWN.
-    UNKNOWN = 0;
-
-    // Sent by the client to start the commit process. See
-    // compositor_message_to_impl.proto for details.
-    BEGIN_MAIN_FRAME = 1;
-  }
-
-  optional Type message_type = 1;
-
-  // Only one of the following fields will be set per CompositorMessageToMain.
-
-  // Set for message Type::BEGIN_MAIN_FRAME.
-  optional BeginMainFrame begin_main_frame_message = 2;
-}
-
-message BeginMainFrame {
-  optional BeginMainFrameAndCommitState begin_main_frame_state = 1;
-}