Minor Fixes for Windows GN build.

tools/gn/secondary/third_party/angle/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This config is applied to internal Angle targets (not pushed to dependents).
 config("internal_config") {
   include_dirs = [
     "include",
     "src",
   ]
@@ skipping 307 matching lines @@
       "src/libGLESv2/Buffer.h",
       "src/libGLESv2/Context.cpp",
       "src/libGLESv2/Context.h",
       "src/libGLESv2/DynamicHLSL.cpp",
       "src/libGLESv2/DynamicHLSL.h",
       "src/libGLESv2/Fence.cpp",
       "src/libGLESv2/Fence.h",
       "src/libGLESv2/Float16ToFloat32.cpp",
       "src/libGLESv2/Framebuffer.cpp",
       "src/libGLESv2/Framebuffer.h",
+      "src/libGLESv2/FramebufferAttachment.cpp",
+      "src/libGLESv2/FramebufferAttachment.h",
       "src/libGLESv2/HandleAllocator.cpp",
       "src/libGLESv2/HandleAllocator.h",
       "src/libGLESv2/Program.cpp",
       "src/libGLESv2/Program.h",
       "src/libGLESv2/ProgramBinary.cpp",
       "src/libGLESv2/ProgramBinary.h",
       "src/libGLESv2/Query.cpp",
       "src/libGLESv2/Query.h",
       "src/libGLESv2/Renderbuffer.cpp",
       "src/libGLESv2/Renderbuffer.h",
@@ skipping 295 matching lines @@
     include_dirs = [ "src/libGLESv2" ]
     libs = [ "d3d9.lib" ]
 
     deps = [
       ":commit_id",
       ":includes",
       ":libGLESv2",
     ]
   }
 }  # is_win