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The first epoch is 0 as that is the one used in the initial transaction, but the code was setting the first `Epoch` to `Epoch(1)`. This means that when layout advanced the epoch, the `Epoch` of the first produced display list was `Epoch(2)`. This change makes the value reflected in `current_epoch` actually match the index of the display list produced. In addition, we always store this epoch in `PipelineDetails` in the renderer. This will be important when adding the `WebView::take_screenshot` API. Testing: This should not change behavior, so is covered by existing tests which rely on proper `Epoch` advancement. Signed-off-by: Martin Robinson <mrobinson@igalia.com>