Make dawn_wire a shared library

Also moves the TerribleCommandBuffer to utils:: because it isn't part of
the implementation of the wire, renames dawn::wire to dawn_wire, moves
src/wire to src/dawn_wire and puts the interface of dawn_wire in
src/include/dawn_wire.

src/dawn_wire/CMakeLists.txt

@@ -0,0 +1,37 @@
+# Copyright 2017 The Dawn Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set(DAWN_WIRE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+set(DAWN_WIRE_INCLUDE_DIR ${INCLUDE_DIR}/dawn_wire)
+
+Generate(
+    LIB_NAME dawn_wire_autogen
+    LIB_TYPE OBJECT
+    FOLDER "wire"
+    PRINT_NAME "dawn_wire autogenerated files"
+    COMMAND_LINE_ARGS
+        ${GENERATOR_COMMON_ARGS}
+        -T dawn_wire
+)
+target_compile_definitions(dawn_wire_autogen PRIVATE DAWN_WIRE_IMPLEMENTATION)
+
+add_library(dawn_wire SHARED
+    $<TARGET_OBJECTS:dawn_wire_autogen>
+	${DAWN_WIRE_DIR}/WireCmd.h
+    ${DAWN_WIRE_INCLUDE_DIR}/Wire.h
+    ${DAWN_WIRE_INCLUDE_DIR}/dawn_wire_export.h
+)
+target_link_libraries(dawn_wire dawn_common)
+target_compile_definitions(dawn_wire PRIVATE DAWN_WIRE_IMPLEMENTATION)
+DawnInternalTarget("wire" dawn_wire)

src/dawn_wire/WireCmd.h

@@ -0,0 +1,68 @@
+// Copyright 2017 The Dawn Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef DAWNWIRE_WIRECMD_H_
+#define DAWNWIRE_WIRECMD_H_
+
+#include <dawn/dawn.h>
+
+#include "dawn_wire/WireCmd_autogen.h"
+
+namespace dawn_wire {
+
+    struct ReturnDeviceErrorCallbackCmd {
+        ReturnWireCmd commandId = ReturnWireCmd::DeviceErrorCallback;
+
+        size_t messageStrlen;
+    };
+
+    struct BufferMapAsyncCmd {
+        WireCmd commandId = WireCmd::BufferMapAsync;
+
+        ObjectId bufferId;
+        ObjectSerial requestSerial;
+        uint32_t start;
+        uint32_t size;
+        bool isWrite;
+    };
+
+    struct ReturnBufferMapReadAsyncCallbackCmd {
+        ReturnWireCmd commandId = ReturnWireCmd::BufferMapReadAsyncCallback;
+
+        ObjectId bufferId;
+        ObjectSerial bufferSerial;
+        uint32_t requestSerial;
+        uint32_t status;
+        uint32_t dataLength;
+    };
+
+    struct ReturnBufferMapWriteAsyncCallbackCmd {
+        ReturnWireCmd commandId = ReturnWireCmd::BufferMapWriteAsyncCallback;
+
+        ObjectId bufferId;
+        ObjectSerial bufferSerial;
+        uint32_t requestSerial;
+        uint32_t status;
+    };
+
+    struct BufferUpdateMappedDataCmd {
+        WireCmd commandId = WireCmd::BufferUpdateMappedDataCmd;
+
+        ObjectId bufferId;
+        uint32_t dataLength;
+    };
+
+}  // namespace dawn_wire
+
+#endif  // DAWNWIRE_WIRECMD_H_