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Remove |copy_required| and replace it with an enum |copy_mode|.

This is done since in future texture copy will not be always required
for webview and hence |copy_required| will not always be true.
When AImageReader is enabled, texture copy can be skipped
and resource sharing across different context can be achieved via
AHardwareBuffer.

TBR=dcheng@chromium.org

Bug: 1091945
Change-Id: Ie482546cc2f28128b487a55205a3c7411bc2a86f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2306670
Commit-Queue: vikas soni <vikassoni@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792652}