Add basic VkSurfaceKHR (Xlib only for now)

Should pass the following deqp tests:
dEQP-VK.wsi.xlib.surface.create
dEQP-VK.wsi.xlib.surface.query_supportS
dEQP-VK.wsi.xlib.surface.query_capabilities
dEQP-VK.wsi.xlib.surface.query_formatsW
dEQP-VK.wsi.xlib.surface.query_present_modes
dEQP-VK.wsi.xlib.surface.destroy_null_handle
dEQP-VK.wsi.xlib.surface.initial_size
dEQP-VK.wsi.xlib.surface.resizeSW

Bug: b/124265819
Change-Id: I92da1cc8d60923ea97aa26d3d6a098274c6e06b7
Reviewed-on: https://swiftshader-review.googlesource.com/c/25308
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Corentin Wallez <cwallez@google.com>
Tested-by: Hernan Liatis <hliatis@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

src/WSI/XlibSurfaceKHR.cpp

diff --git a/src/WSI/XlibSurfaceKHR.cpp b/src/WSI/XlibSurfaceKHR.cpp
new file mode 100644
index 0000000..9dd7575
--- /dev/null
+++ b/src/WSI/XlibSurfaceKHR.cpp
@@ -0,0 +1,42 @@
+// 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.
+
+#include "XlibSurfaceKHR.hpp"
+
+namespace vk {
+
+XlibSurfaceKHR::XlibSurfaceKHR(const VkXlibSurfaceCreateInfoKHR *pCreateInfo, void *mem) :
+		pDisplay(pCreateInfo->dpy),
+		window(pCreateInfo->window) {
+
+}
+
+void XlibSurfaceKHR::destroySurface(const VkAllocationCallbacks *pAllocator) {
+
+}
+
+size_t XlibSurfaceKHR::ComputeRequiredAllocationSize(const VkXlibSurfaceCreateInfoKHR *pCreateInfo) {
+	return 0;
+}
+
+void XlibSurfaceKHR::getSurfaceCapabilities(VkSurfaceCapabilitiesKHR *pSurfaceCapabilities) const {
+	SurfaceKHR::getSurfaceCapabilities(pSurfaceCapabilities);
+
+	XWindowAttributes attr;
+	libX11->XGetWindowAttributes(pDisplay, window, &attr);
+	VkExtent2D extent = {static_cast<uint32_t>(attr.width), static_cast<uint32_t>(attr.height)};
+
+	pSurfaceCapabilities->currentExtent = extent;
+	pSurfaceCapabilities->minImageExtent = extent;
+	pSurfaceCapabilities->maxImageExtent = extent;
+}
+
+}
\ No newline at end of file