Enable disabled test in ui/gfx/mojo/.

There's no real reason not to run this test on iOS/Android, as they define an
AcceleratedWidget type and the test works correctly when they're serialized
appropriately.  The correct struct traits are obvious, so I don't see any
benefit to not defining them.

Bug: none
Change-Id: I58db88a774abb441bb3af8e7f458040214c5fd93
Reviewed-on: https://chromium-review.googlesource.com/c/1343562Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610907}

ui/gfx/mojo/OWNERS

@@ -5,5 +5,7 @@ per-file *.mojom=set noparent
 per-file *.mojom=file://ipc/SECURITY_OWNERS
 per-file *_mojom_traits*.*=set noparent
 per-file *_mojom_traits*.*=file://ipc/SECURITY_OWNERS
+per-file *_struct_traits*.*=set noparent
+per-file *_struct_traits*.*=file://ipc/SECURITY_OWNERS
 per-file *.typemap=set noparent
 per-file *.typemap=file://ipc/SECURITY_OWNERS

ui/gfx/mojo/accelerated_widget_struct_traits.h

@@ -15,7 +15,7 @@ template <>
 struct StructTraits<gfx::mojom::AcceleratedWidgetDataView,
                     gfx::AcceleratedWidget> {
   static uint64_t widget(gfx::AcceleratedWidget widget) {
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_ANDROID) || defined(OS_IOS)
     return reinterpret_cast<uint64_t>(widget);
 #elif defined(USE_OZONE) || defined(USE_X11) || defined(OS_MACOSX)
     return static_cast<uint64_t>(widget);
@@ -27,7 +27,7 @@ struct StructTraits<gfx::mojom::AcceleratedWidgetDataView,
 
   static bool Read(gfx::mojom::AcceleratedWidgetDataView data,
                    gfx::AcceleratedWidget* out) {
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_ANDROID) || defined(OS_IOS)
     *out = reinterpret_cast<gfx::AcceleratedWidget>(data.widget());
     return true;
 #elif defined(USE_OZONE) || defined(USE_X11) || defined(OS_MACOSX)

ui/gfx/mojo/struct_traits_unittest.cc

@@ -129,15 +129,7 @@ TEST_F(StructTraitsTest, Transform) {
   EXPECT_EQ(col4row4, output.matrix().get(3, 3));
 }
 
-// AcceleratedWidgets can only be sent between processes on some platforms.
-#if defined(OS_WIN) || defined(USE_OZONE) || defined(USE_X11) || \
-    defined(OS_MACOSX)
-#define MAYBE_AcceleratedWidget AcceleratedWidget
-#else
-#define MAYBE_AcceleratedWidget DISABLED_AcceleratedWidget
-#endif
-
-TEST_F(StructTraitsTest, MAYBE_AcceleratedWidget) {
+TEST_F(StructTraitsTest, AcceleratedWidget) {
   gfx::AcceleratedWidget input(CastToAcceleratedWidget(1001));
   gfx::AcceleratedWidget output;
   mojo::test::SerializeAndDeserialize<gfx::mojom::AcceleratedWidget>(&input,