Limit the number of ARC codec

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.mojom;
 
 [Extensible]
@@ skipping 32 matching lines @@
     DEVICE_ENCODER = 0,
     DEVICE_DECODER = 1,
   };
 
   DeviceType device_type;
   uint32 num_input_buffers;
   uint32 input_pixel_format;
 };
 
 interface VideoAcceleratorService {
-  Initialize@0(ArcVideoAcceleratorConfig config) => (bool result);
+  enum Result {
+    NO_ERROR = 0,
+    ILLEGAL_STATE = 1,
+    INVALID_ARGUMENT = 2,
+    UNREADABLE_INPUT = 3,
+    PLATFORM_FAILURE = 4,
+    INSUFFICIENT_RESOURCES = 5,
+  };
+
+  Initialize@0(ArcVideoAcceleratorConfig config)
+      => (bool result, [MinVersion=1] Result error);
 
   BindSharedMemory@1(PortType port, uint32 index, handle ashmem_fd,
-                   uint32 offset, uint32 length);
+                     uint32 offset, uint32 length);
 
   BindDmabuf@2(PortType port, uint32 index, handle dmabuf_fd, int32 stride);
 
   UseBuffer@3(PortType port, uint32 index, BufferMetadata metadata);
 
   SetNumberOfOutputBuffers@4(uint32 number);
 
   Reset@5();
 
   Flush@6();
 };
 
 interface VideoAcceleratorServiceClient {
-  enum Error {
-    NO_ERROR = 0,
-    ILLEGAL_STATE = 1,
-    INVALID_ARGUMENT = 2,
-    UNREADABLE_INPUT = 3,
-    PLATFORM_FAILURE = 4,
-  };
-
   Init@0(VideoAcceleratorService service_ptr);
 
-  OnError@1(Error error);
+  OnError@1(VideoAcceleratorService.Result error);
 
   OnBufferDone@2(PortType port, uint32 index, BufferMetadata metadata);
 
   OnResetDone@3();
 
   OnOutputFormatChanged@4(VideoFormat format);
 
   OnFlushDone@5();
 };