More YVU_420 buffers support.

ui/ozone/platform/drm/gpu/gbm_buffer.cc

Index: ui/ozone/platform/drm/gpu/gbm_buffer.cc
diff --git a/ui/ozone/platform/drm/gpu/gbm_buffer.cc b/ui/ozone/platform/drm/gpu/gbm_buffer.cc
index ca9a55b986c60162305bf75b619df72e9046b642..2faa8fb3fea7196fd0cb0a1b2f71c629c0d6fffb 100644
--- a/ui/ozone/platform/drm/gpu/gbm_buffer.cc
+++ b/ui/ozone/platform/drm/gpu/gbm_buffer.cc
@@ -164,13 +164,15 @@ gfx::NativePixmapHandle GbmPixmap::ExportHandle() {
   gfx::NativePixmapHandle handle;
   for (size_t i = 0;
        i < gfx::NumberOfPlanesForBufferFormat(buffer_->GetFormat()); ++i) {
-    base::ScopedFD scoped_fd(HANDLE_EINTR(dup(buffer_->GetFd(i))));
-    if (!scoped_fd.is_valid()) {
-      PLOG(ERROR) << "dup";
-      return gfx::NativePixmapHandle();
+    if (i < buffer_->GetFdCount()) {

[dnicoara, 2016/06/13 13:41:17]

nit: Would you mind adding a comment explaining why this is done? It'll be
easier for future readers to understand without going through a chain of
codereviews.

[Daniele Castagna, 2016/06/13 17:07:58]

Done.

+      base::ScopedFD scoped_fd(HANDLE_EINTR(dup(buffer_->GetFd(i))));
+      if (!scoped_fd.is_valid()) {
+        PLOG(ERROR) << "dup";
+        return gfx::NativePixmapHandle();
+      }
+      handle.fds.emplace_back(
+          base::FileDescriptor(scoped_fd.release(), true /* auto_close */));
     }
-    handle.fds.emplace_back(
-        base::FileDescriptor(scoped_fd.release(), true /* auto_close */));
     handle.strides_and_offsets.emplace_back(buffer_->GetStride(i),
                                             buffer_->GetOffset(i));
   }