[Fuchsia] Enable ozone_demo and ozone_gl_unittests targets

Also enabled gl_image_native_pixmap.cc on Fuchisa. ExportHandle() is
currently stubbed as NOTIMPLEMENTED.

Bug: 852011, 766360
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I2978a320fef928f32b3ff27473c593293a8168d6
Reviewed-on: https://chromium-review.googlesource.com/1112592
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569912}

BUILD.gn

@@ -260,16 +260,10 @@ group("gn_all") {
     deps += [
       "//ui/ozone",
       "//ui/ozone:ozone_unittests",
+      "//ui/ozone/demo",
+      "//ui/ozone/gl:ozone_gl_unittests",
     ]
 
-    # TODO(crbug.com/766360): These require a working GL implementation.
-    if (!is_fuchsia) {
-      deps += [
-        "//ui/ozone/demo",
-        "//ui/ozone/gl:ozone_gl_unittests",
-      ]
-    }
-
     if (ozone_platform_x11) {
       deps += [ "//ui/ozone:ozone_x11_unittests" ]
     }

ui/gl/BUILD.gn

@@ -191,7 +191,7 @@ component("gl") {
       "gl_surface_egl.h",
     ]
 
-    if (is_linux || (is_win && use_ozone)) {
+    if (is_linux || use_ozone) {
       sources += [
         "gl_image_native_pixmap.cc",
         "gl_image_native_pixmap.h",

ui/gl/gl_image_native_pixmap.cc

@@ -6,6 +6,8 @@
 
 #include <vector>
 
+#include "base/files/scoped_file.h"
+#include "build/build_config.h"
 #include "ui/gfx/buffer_format_util.h"
 #include "ui/gl/egl_util.h"
 #include "ui/gl/gl_context.h"
@@ -282,6 +284,11 @@ gfx::NativePixmapHandle GLImageNativePixmap::ExportHandle() {
     }
   }
 
+#if defined(OS_FUCHSIA)
+  // TODO(crbug.com/852011): Implement image handle export on Fuchsia.
+  NOTIMPLEMENTED();
+  return gfx::NativePixmapHandle();
+#else   // defined(OS_FUCHSIA)
   std::vector<int> fds(num_planes);
   std::vector<EGLint> strides(num_planes);
   std::vector<EGLint> offsets(num_planes);
@@ -317,6 +324,7 @@ gfx::NativePixmapHandle GLImageNativePixmap::ExportHandle() {
   }
 
   return handle;
+#endif  // !defined(OS_FUCHSIA)
 }
 
 unsigned GLImageNativePixmap::GetInternalFormat() {