gl: Move platform-specific EGL code into separate files

ui/gl/gl_surface_win.cc

 // Copyright (c) 2012 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.
 
 #include "ui/gl/gl_surface.h"
 
 #include <dwmapi.h>
 
+#include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/win/windows_version.h"
 #include "third_party/mesa/src/include/GL/osmesa.h"
 #include "ui/gfx/frame_time.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface_egl.h"
 #include "ui/gl/gl_surface_osmesa.h"
 #include "ui/gl/gl_surface_stub.h"
 #include "ui/gl/gl_surface_wgl.h"
 
+// From ANGLE's egl/eglext.h.
+#if !defined(EGL_D3D11_ELSE_D3D9_DISPLAY_ANGLE)
+#define EGL_D3D11_ELSE_D3D9_DISPLAY_ANGLE \
+  reinterpret_cast<EGLNativeDisplayType>(-2)
+#endif
+
 namespace gfx {
 
 // This OSMesa GL surface can use GDI to swap the contents of the buffer to a
 // view.
 class NativeViewGLSurfaceOSMesa : public GLSurfaceOSMesa {
  public:
   explicit NativeViewGLSurfaceOSMesa(gfx::AcceleratedWidget window);
   virtual ~NativeViewGLSurfaceOSMesa();
 
   // Implement subset of GLSurface.
@@ skipping 247 matching lines @@
       return surface;
     }
     case kGLImplementationMockGL:
       return new GLSurfaceStub;
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
+EGLNativeDisplayType GetPlatformDefaultEGLNativeDisplay() {
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableD3D11))
+    return EGL_D3D11_ELSE_D3D9_DISPLAY_ANGLE;
+
+  return EGL_DEFAULT_DISPLAY;
+}
+
 }  // namespace gfx