Add module suffix in .mojom files for components/arc

components/arc/common/video_accelerator.mojom

 // 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.
 
 // This file defined the mojo interface between Android and Chromium for video
 // decoding and encoding. See comments of ArcVideoAccelerator for more info.
 
-module arc;
+module arc.mojom;
 
 [Extensible]
 enum HalPixelFormatExtension {
   HAL_PIXEL_FORMAT_YCbCr_420_888 = 0x23,
   HAL_PIXEL_FORMAT_H264 = 0x34363248,
   HAL_PIXEL_FORMAT_VP8 = 0x00385056,
 };
 
 enum PortType {
   PORT_INPUT = 0,
@@ skipping 63 matching lines @@
   Init@0(VideoAcceleratorService service_ptr);
 
   OnError@1(Error error);
 
   OnBufferDone@2(PortType port, uint32 index, BufferMetadata metadata);
 
   OnResetDone@3();
 
   OnOutputFormatChanged@4(VideoFormat format);
 };