win: distrib: Add DirectX compiler binaries for WebGPU (fixes #3646)

cmake/cef_variables.cmake.in

@@ -554,6 +554,13 @@ if(OS_WINDOWS)
     vulkan-1.dll
     )
 
+  if(PROJECT_ARCH STREQUAL "x86_64")
+    list(APPEND CEF_BINARY_FILES
+      dxil.dll
+      dxcompiler.dll
+      )
+  endif()
+
   # List of CEF resource files.
   set(CEF_RESOURCE_FILES
     chrome_100_percent.pak

tools/distrib/win/README.redistrib.txt

@@ -56,6 +56,12 @@ run but any related functionality may become broken or disabled.
   is recommended instead of relying on the possibly old and untested system
   installed version.
 
+* DirectX compiler support (x64 only).
+  * dxil.dll
+  * dxcompiler.dll
+  Support for DirectX rendering of WebGPU. Without these files the
+  aforementioned capabilities may fail.
+
 * ANGLE support.
   * libEGL.dll
   * libGLESv2.dll

tools/make_distrib.py

@@ -890,6 +890,8 @@ if platform == 'windows':
   binaries = [
       {'path': 'chrome_elf.dll'},
       {'path': 'd3dcompiler_47.dll'},
+      {'path': 'dxcompiler.dll', 'conditional': True},
+      {'path': 'dxil.dll', 'conditional': True},
       {'path': libcef_dll},
       {'path': 'libEGL.dll'},
       {'path': 'libGLESv2.dll'},