s/OutputAttachment/RenderAttachment/g

But also keep OutputAttachment so it can be gradually changed in all
dependants.

See https://github.com/gpuweb/gpuweb/pull/1168 and
https://github.com/gpuweb/gpuweb/pull/1168

Bug: dawn:22
Change-Id: I6a1ec1de6c22ca4deac88b7fffde4b98d9d54a84
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/31040
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
diff --git a/examples/ManualSwapChainTest.cpp b/examples/ManualSwapChainTest.cpp
index 9e3990d..8918fed 100644
--- a/examples/ManualSwapChainTest.cpp
+++ b/examples/ManualSwapChainTest.cpp
@@ -111,7 +111,7 @@
     glfwSetKeyCallback(window, OnKeyPress);
 
     wgpu::SwapChainDescriptor descriptor;
-    descriptor.usage = wgpu::TextureUsage::OutputAttachment;
+    descriptor.usage = wgpu::TextureUsage::RenderAttachment;
     descriptor.format = wgpu::TextureFormat::BGRA8Unorm;
     descriptor.width = 0;
     descriptor.height = 0;
@@ -165,8 +165,8 @@
 
 std::ostream& operator<<(std::ostream& o, const wgpu::SwapChainDescriptor& desc) {
     // For now only output attachment is possible.
-    ASSERT(desc.usage == wgpu::TextureUsage::OutputAttachment);
-    o << "OutputAttachment ";
+    ASSERT(desc.usage == wgpu::TextureUsage::RenderAttachment);
+    o << "RenderAttachment ";
     o << desc.width << "x" << desc.height << " ";
 
     // For now only BGRA is allowed