Add initial CMakeLists.txt files

Adds CMake support for:
 - Generating the Dawn headers and C++ wrappers
 - libdawn_wire
 - libdawn_native with the Metal backend for now
 - All the examples.

Bug: dawn:333

Change-Id: I6ffbe090b0bd21d6a805c03a507ad51fda0275ca
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/15720
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>

src/common/CMakeLists.txt

@@ -0,0 +1,48 @@
+# Copyright 2020 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.
+
+add_library(dawn_common STATIC ${DAWN_DUMMY_FILE})
+target_sources(dawn_common PRIVATE
+    "Assert.cpp"
+    "Assert.h"
+    "BitSetIterator.h"
+    "Compiler.h"
+    "Constants.h"
+    "DynamicLib.cpp"
+    "DynamicLib.h"
+    "GPUInfo.cpp"
+    "GPUInfo.h"
+    "HashUtils.h"
+    "Log.cpp"
+    "Log.h"
+    "Math.cpp"
+    "Math.h"
+    "Platform.h"
+    "Result.cpp"
+    "Result.h"
+    "Serial.h"
+    "SerialMap.h"
+    "SerialQueue.h"
+    "SerialStorage.h"
+    "SwapChainUtils.h"
+    "SystemUtils.cpp"
+    "SystemUtils.h"
+    "vulkan_platform.h"
+    "windows_with_undefs.h"
+    "xlib_with_undefs.h"
+)
+target_link_libraries(dawn_common PRIVATE dawn_internal_config)
+
+# TODO Android Log support
+# TODO Vulkan headers support