Make libdawn_native a shared library.

The interface exposed by libdawn_native is declared in the new headers
living in src/include/dawn_native so that they both the users and the
libraries use the DAWN_NATIVE_EXPORT macros.

src/utils/CMakeLists.txt

@@ -54,8 +54,7 @@ if (DAWN_ENABLE_VULKAN)
 endif()
 
 add_library(utils STATIC ${UTILS_SOURCES})
-target_link_libraries(utils libdawn_native shaderc_shared libdawn)
-target_include_directories(utils PUBLIC ${SRC_DIR})
+target_link_libraries(utils libdawn_native shaderc_shared libdawn glfw)
 DawnInternalTarget("" utils)
 if(NOT MSVC)
     # allow C-style casts -- for shaderc

src/utils/D3D12Binding.cpp

@@ -15,20 +15,12 @@
 #include "utils/BackendBinding.h"
 
 #include "common/Assert.h"
-#include "dawn/dawn_wsi.h"
+#include "dawn_native/D3D12Backend.h"
 
 #include "GLFW/glfw3.h"
 #define GLFW_EXPOSE_NATIVE_WIN32
 #include "GLFW/glfw3native.h"
 
-namespace dawn_native { namespace d3d12 {
-    void Init(dawnProcTable* procs, dawnDevice* device);
-
-    dawnSwapChainImplementation CreateNativeSwapChainImpl(dawnDevice device, HWND window);
-    dawnTextureFormat GetNativeSwapChainPreferredFormat(
-        const dawnSwapChainImplementation* swapChain);
-}}  // namespace dawn_native::d3d12
-
 namespace utils {
 
     class D3D12Binding : public BackendBinding {

src/utils/MetalBinding.mm

@@ -16,21 +16,12 @@
 
 #include "common/Assert.h"
 #include "common/SwapChainUtils.h"
-#include "dawn/dawn_wsi.h"
+#include "dawn_native/MetalBackend.h"
 
 #define GLFW_EXPOSE_NATIVE_COCOA
 #include "GLFW/glfw3.h"
 #include "GLFW/glfw3native.h"
 
-#import <Metal/Metal.h>
-#import <QuartzCore/CAMetalLayer.h>
-
-namespace dawn_native { namespace metal {
-    void Init(id<MTLDevice> metalDevice, dawnProcTable* procs, dawnDevice* device);
-    void SetNextDrawable(dawnDevice device, id<CAMetalDrawable> drawable);
-    void Present(dawnDevice device);
-}}
-
 namespace utils {
     class SwapChainImplMTL {
       public:

src/utils/NullBinding.cpp

@@ -14,9 +14,7 @@
 
 #include "utils/BackendBinding.h"
 
-namespace dawn_native { namespace null {
-    void Init(dawnProcTable* procs, dawnDevice* device);
-}}  // namespace dawn_native::null
+#include "dawn_native/NullBackend.h"
 
 namespace utils {
 

src/utils/OpenGLBinding.cpp

@@ -18,6 +18,7 @@
 #include "common/Platform.h"
 #include "common/SwapChainUtils.h"
 #include "dawn/dawn_wsi.h"
+#include "dawn_native/OpenGLBackend.h"
 
 // Glad needs to be included before GLFW otherwise it complain that GL.h was already included
 #include "glad/glad.h"
@@ -25,10 +26,6 @@
 #include <cstdio>
 #include "GLFW/glfw3.h"
 
-namespace dawn_native { namespace opengl {
-    void Init(void* (*getProc)(const char*), dawnProcTable* procs, dawnDevice* device);
-}}  // namespace dawn_native::opengl
-
 namespace utils {
     class SwapChainImplGL {
       public:

src/utils/VulkanBinding.cpp

@@ -15,27 +15,11 @@
 #include "utils/BackendBinding.h"
 
 #include "common/Assert.h"
-#include "dawn/dawn_wsi.h"
+#include "dawn_native/VulkanBackend.h"
 
-#include <vulkan/vulkan.h>
-
-// Include GLFW after Vulkan so that it declares the Vulkan-specific functions
+// Include GLFW after VulkanBackend so that it declares the Vulkan-specific functions
 #include "GLFW/glfw3.h"
 
-#include <vector>
-
-namespace dawn_native { namespace vulkan {
-    void Init(dawnProcTable* procs,
-              dawnDevice* device,
-              const std::vector<const char*>& requiredInstanceExtensions);
-
-    VkInstance GetInstance(dawnDevice device);
-
-    dawnSwapChainImplementation CreateNativeSwapChainImpl(dawnDevice device, VkSurfaceKHR surface);
-    dawnTextureFormat GetNativeSwapChainPreferredFormat(
-        const dawnSwapChainImplementation* swapChain);
-}}  // namespace dawn_native::vulkan
-
 namespace utils {
 
     class SwapChainImplVulkan {