Rename Transfer[Src|Dst] to Copy[Src|Dst]

This is to match the equivalent rename in WebGPU's IDL.

BUG=dawn:22

Change-Id: Ibdf75869e58835d984df559878b884c55310a403
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/8623
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Yunchao He <yunchao.he@intel.com>
diff --git a/examples/CppHelloTriangle.cpp b/examples/CppHelloTriangle.cpp
index dc8f242..39a6d93 100644
--- a/examples/CppHelloTriangle.cpp
+++ b/examples/CppHelloTriangle.cpp
@@ -58,7 +58,7 @@
     descriptor.sampleCount = 1;
     descriptor.format = dawn::TextureFormat::RGBA8Unorm;
     descriptor.mipLevelCount = 1;
-    descriptor.usage = dawn::TextureUsageBit::TransferDst | dawn::TextureUsageBit::Sampled;
+    descriptor.usage = dawn::TextureUsageBit::CopyDst | dawn::TextureUsageBit::Sampled;
     texture = device.CreateTexture(&descriptor);
 
     dawn::SamplerDescriptor samplerDesc = utils::GetDefaultSamplerDescriptor();
@@ -70,7 +70,8 @@
         data[i] = static_cast<uint8_t>(i % 253);
     }
 
-    dawn::Buffer stagingBuffer = utils::CreateBufferFromData(device, data.data(), static_cast<uint32_t>(data.size()), dawn::BufferUsageBit::TransferSrc);
+    dawn::Buffer stagingBuffer = utils::CreateBufferFromData(
+        device, data.data(), static_cast<uint32_t>(data.size()), dawn::BufferUsageBit::CopySrc);
     dawn::BufferCopyView bufferCopyView = utils::CreateBufferCopyView(stagingBuffer, 0, 0, 0);
     dawn::TextureCopyView textureCopyView = utils::CreateTextureCopyView(texture, 0, 0, {0, 0, 0});
     dawn::Extent3D copySize = {1024, 1024, 1};