gl: Move platform-specific EGL code into separate files

ui/gl/gl_surface_win.cc

Index: ui/gl/gl_surface_win.cc
diff --git a/ui/gl/gl_surface_win.cc b/ui/gl/gl_surface_win.cc
index 7540b1fc35d6125c14f3aef83327cd83bbfe37cc..60f0acde2eaaf31fd65afe1c684ab72ac0ae3600 100644
--- a/ui/gl/gl_surface_win.cc
+++ b/ui/gl/gl_surface_win.cc
@@ -20,8 +20,26 @@
 #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 {
 
+namespace {
+
+EGLNativeDisplayType GetEGLDisplay() {
+  EGLNativeDisplayType_native_display = EGL_DEFAULT_DISPLAY;
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableD3D11) &&
+      CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableD3D11)) {
+    native_display = EGL_D3D11_ELSE_D3D9_DISPLAY_ANGLE;
+  }
+
+  return native_display;
+}
+
 // This OSMesa GL surface can use GDI to swap the contents of the buffer to a
 // view.
 class NativeViewGLSurfaceOSMesa : public GLSurfaceOSMesa {
@@ -94,7 +112,7 @@ bool GLSurface::InitializeOneOffInternal() {
       }
       break;
     case kGLImplementationEGLGLES2:
-      if (!GLSurfaceEGL::InitializeOneOff()) {
+      if (!GLSurfaceEGL::InitializeOneOff(GetEGLDisplay())) {
         LOG(ERROR) << "GLSurfaceEGL::InitializeOneOff failed.";
         return false;
       }