adds WARP support to Chromium, for Metro mode only, on Windows 8

ui/gl/gl_surface_egl.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_egl.h"
 
 #if defined(OS_ANDROID)
 #include <android/native_window_jni.h>
 #endif
 
@@ skipping 80 matching lines @@
 }  // namespace
 
 GLSurfaceEGL::GLSurfaceEGL() {}
 
 bool GLSurfaceEGL::InitializeOneOff() {
   static bool initialized = false;
   if (initialized)
     return true;
 
   g_native_display = GetPlatformDefaultEGLNativeDisplay();
+
+#if defined(OS_WIN)
+  const EGLenum platform = GetPlatformDefaultEGLNativePlatform();
+  const EGLint* attributes = GetPlatformDefaultEGLNativeDisplayAttributes();
+  g_display = eglGetPlatformDisplayEXT(platform, g_native_display, attributes);

[Geoff Lang, 2014/08/27 21:05:04]

You should check for the existence of the extensions before calling this. 
ANGLE_platform_angle and ANGLE_platform_angle_d3d (if using a D3D type enum).

[luken, 2014/08/27 21:38:17]

Don't you need the display object returned by
eglGetDisplay/eglGetPlatformDisplayEXT to call eglQueryString? Or is there
another way?

[Geoff Lang, 2014/08/28 13:45:54]

Yea, you're able to use eglQueryString(EGL_NO_DISPLAY) if the
EGL_EXT_client_extensions is present.

[luken, 2014/08/28 23:50:33]

Cool, will do, thanks.

+#else
   g_display = eglGetDisplay(g_native_display);
+#endif
   if (!g_display) {
     LOG(ERROR) << "eglGetDisplay failed with error " << GetLastEGLErrorString();
     return false;
   }
 
   if (!eglInitialize(g_display, NULL, NULL)) {
     LOG(ERROR) << "eglInitialize failed with error " << GetLastEGLErrorString();
     return false;
   }
 
@@ skipping 536 matching lines @@
 }
 
 void* SurfacelessEGL::GetShareHandle() {
   return NULL;
 }
 
 SurfacelessEGL::~SurfacelessEGL() {
 }
 
 }  // namespace gfx