Remove windows/mac/ios specific code from //ui

ui/gl/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.
 
 import("//build/config/ui.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 config("gl_config") {
   if (use_x11) {
     defines = [ "GL_GLEXT_PROTOTYPES" ]
   }
 }
 
 component("gl") {
   output_name = "gl_wrapper"  # Avoid colliding with OS X"s libGL.dylib.
 
   sources = [
     "android/gl_jni_registrar.cc",
     "android/gl_jni_registrar.h",
     "android/scoped_java_surface.cc",
     "android/scoped_java_surface.h",
     "android/surface_texture.cc",
     "android/surface_texture.h",
     "android/surface_texture_listener.cc",
     "android/surface_texture_listener.h",
+    "egl_util.cc",
+    "egl_util.h",
     "gl_bindings.cc",
     "gl_bindings.h",
+    "gl_bindings_autogen_egl.cc",
+    "gl_bindings_autogen_egl.h",
     "gl_bindings_autogen_gl.cc",
     "gl_bindings_autogen_gl.h",
     "gl_bindings_autogen_osmesa.cc",
     "gl_bindings_autogen_osmesa.h",
     "gl_bindings_skia_in_process.cc",
     "gl_bindings_skia_in_process.h",
     "gl_context.cc",
     "gl_context.h",
     "gl_context_android.cc",
+    "gl_context_egl.cc",
+    "gl_context_egl.h",
     "gl_context_mac.mm",
     "gl_context_osmesa.cc",
     "gl_context_osmesa.h",
     "gl_context_stub.cc",
     "gl_context_stub.h",
     "gl_context_stub_with_extensions.cc",
     "gl_context_stub_with_extensions.h",
     "gl_context_win.cc",
     "gl_enums.cc",
     "gl_enums.h",
     "gl_enums_implementation_autogen.h",
     "gl_export.h",
     "gl_fence.cc",
     "gl_fence.h",
     "gl_fence_arb.cc",
     "gl_fence_arb.h",
+    "gl_fence_egl.cc",
+    "gl_fence_egl.h",
     "gl_fence_nv.cc",
     "gl_fence_nv.h",
     "gl_gl_api_implementation.cc",
     "gl_gl_api_implementation.h",
     "gl_image.h",
+    "gl_image_egl.cc",
+    "gl_image_egl.h",
     "gl_image_memory.cc",
     "gl_image_memory.h",
     "gl_image_ref_counted_memory.cc",
     "gl_image_ref_counted_memory.h",
     "gl_image_shared_memory.cc",
     "gl_image_shared_memory.h",
     "gl_image_stub.cc",
     "gl_image_stub.h",
     "gl_implementation.cc",
     "gl_implementation.h",
     "gl_implementation_android.cc",
     "gl_implementation_mac.cc",
     "gl_implementation_win.cc",
     "gl_osmesa_api_implementation.cc",
     "gl_osmesa_api_implementation.h",
     "gl_share_group.cc",
     "gl_share_group.h",
     "gl_state_restorer.cc",
     "gl_state_restorer.h",
     "gl_surface.cc",
     "gl_surface.h",
     "gl_surface_android.cc",
+    "gl_surface_egl.cc",
+    "gl_surface_egl.h",
     "gl_surface_mac.cc",
     "gl_surface_osmesa.cc",
     "gl_surface_osmesa.h",
     "gl_surface_stub.cc",
     "gl_surface_stub.h",
     "gl_surface_win.cc",
     "gl_switches.cc",
     "gl_switches.h",
     "gl_version_info.cc",
     "gl_version_info.h",
@@ skipping 25 matching lines @@
     "//skia",
   ]
   public_deps = [
     "//base",
     "//third_party/mesa:mesa_headers",
     "//ui/events/platform",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
-  if (is_win || is_android || is_linux) {
-    sources += [
-      "egl_util.cc",
-      "egl_util.h",
-      "gl_bindings_autogen_egl.cc",
-      "gl_bindings_autogen_egl.h",
-      "gl_context_egl.cc",
-      "gl_context_egl.h",
-      "gl_fence_egl.cc",
-      "gl_fence_egl.h",
-      "gl_image_egl.cc",
-      "gl_image_egl.h",
-      "gl_surface_egl.cc",
-      "gl_surface_egl.h",
-    ]
-  }
   if (is_android || is_linux) {
     sources += [
       "gl_implementation_osmesa.cc",
       "gl_implementation_osmesa.h",
     ]
   }
   if (is_linux) {
     deps += [ "//third_party/libevent" ]
     sources += [
       "gl_image_linux_dma_buffer.cc",
@@ skipping 20 matching lines @@
     ]
 
     configs += [
       "//build/config/linux:x11",
       "//build/config/linux:xcomposite",
       "//build/config/linux:xext",
     ]
 
     deps += [ "//ui/gfx/x" ]
   }
-  if (is_win) {
-    sources += [
-      "angle_platform_impl.cc",
-      "angle_platform_impl.h",
-      "gl_bindings_autogen_wgl.cc",
-      "gl_bindings_autogen_wgl.h",
-      "gl_context_wgl.cc",
-      "gl_context_wgl.h",
-      "gl_egl_api_implementation.cc",
-      "gl_egl_api_implementation.h",
-      "gl_surface_wgl.cc",
-      "gl_surface_wgl.h",
-      "gl_wgl_api_implementation.cc",
-      "gl_wgl_api_implementation.h",
-    ]
-
-    libs = [ "dwmapi.lib" ]
-    ldflags = [ "/DELAYLOAD:dwmapi.dll" ]
-  }
-  if (is_mac) {
-    sources += [
-      "gl_context_cgl.cc",
-      "gl_context_cgl.h",
-      "gl_fence_apple.cc",
-      "gl_fence_apple.h",
-      "gl_image_io_surface.cc",
-      "gl_image_io_surface.h",
-      "scoped_cgl.cc",
-      "scoped_cgl.h",
-    ]
-
-    libs = [
-      "IOSurface.framework",
-      "OpenGL.framework",
-    ]
-  }
   if (is_android) {
     sources += [
       "gl_egl_api_implementation.cc",
       "gl_egl_api_implementation.h",
       "gl_image_surface_texture.cc",
       "gl_image_surface_texture.h",
     ]
 
     defines += [
       "GL_GLEXT_PROTOTYPES",
@@ skipping 51 matching lines @@
     deps = [
       ":surface_jni_headers",
     ]
     sources = [
       "../android/java/src/org/chromium/ui/gl/SurfaceTextureListener.java",
       "../android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java",
     ]
     jni_package = "ui/gl"
   }
 }