OpenXR XrSwapchainCreateInfo Incorrect Format

Current OpenXr implementation has DXGI_FORMAT_R8G8B8A8_UNORM format, but
DXGI_FORMAT_R8G8B8A8_UNORM_SRGB should be used.
OpenXR's swapchain format expects to describe the texture content.
The result of a swapchain image created from OpenXR API always contains a typeless texture.
On the other hand, WebGL API uses CSS color convention that's sRGB.
The RGBA typelss texture from OpenXR swapchain image leads to a linear format render target view
(reference to function D3D11TextureHelper::EnsureRenderTargetView in d3d11_texture_helper.cc).
Therefore, the content in this openxr swapchain image is in sRGB format.

Fixed: 1020392
Change-Id: Id1526e4b3061c81dfb48b5b9fd4bdced7831fd11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894049
Commit-Queue: Zheng Qin <zheqi@microsoft.com>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723518}

device/vr/openxr/openxr_api_wrapper.cc

@@ -280,7 +280,14 @@ XrResult OpenXrApiWrapper::CreateSwapchain() {
 
   XrSwapchainCreateInfo swapchain_create_info = {XR_TYPE_SWAPCHAIN_CREATE_INFO};
   swapchain_create_info.arraySize = 1;
-  swapchain_create_info.format = DXGI_FORMAT_R8G8B8A8_UNORM;
+  // OpenXR's swapchain format expects to describe the texture content.
+  // The result of a swapchain image created from OpenXR API always contains a
+  // typeless texture. On the other hand, WebGL API uses CSS color convention
+  // that's sRGB. The RGBA typelss texture from OpenXR swapchain image leads to
+  // a linear format render target view (reference to function
+  // D3D11TextureHelper::EnsureRenderTargetView in d3d11_texture_helper.cc).
+  // Therefore, the content in this openxr swapchain image is in sRGB format.
+  swapchain_create_info.format = DXGI_FORMAT_R8G8B8A8_UNORM_SRGB;
 
   // WebVR and WebXR textures are double wide, meaning the texture contains
   // both the left and the right eye, so the width of the swapchain texture

device/vr/openxr/test/fake_openxr_impl_api.cc

@@ -251,7 +251,7 @@ XrResult xrCreateSwapchain(XrSession session,
             XR_ERROR_VALIDATION_FAILURE,
             "XrSwapchainCreateInfo usageFlags is not "
             "XR_SWAPCHAIN_USAGE_COLOR_ATTACHMENT_BIT");
-  RETURN_IF(create_info->format != DXGI_FORMAT_R8G8B8A8_UNORM,
+  RETURN_IF(create_info->format != DXGI_FORMAT_R8G8B8A8_UNORM_SRGB,
             XR_ERROR_SWAPCHAIN_FORMAT_UNSUPPORTED,
             "XrSwapchainCreateInfo format unsupported");
   RETURN_IF(create_info->sampleCount != OpenXrTestHelper::kSwapCount,