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

ui/gl/gl_surface_egl.cc

Index: ui/gl/gl_surface_egl.cc
diff --git a/ui/gl/gl_surface_egl.cc b/ui/gl/gl_surface_egl.cc
index 5a0538e0adda45cc8264c9fc78aea58e4b2e00ee..28b96ae04ecbe47a3c9ba0f730c7fc92c3f69eb0 100644
--- a/ui/gl/gl_surface_egl.cc
+++ b/ui/gl/gl_surface_egl.cc
@@ -98,7 +98,14 @@ bool GLSurfaceEGL::InitializeOneOff() {
     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;