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This method is for deserializing paint ops from binary data, and append
paint ops to the PaintOpBuffer. It can be used for reusing
PaintOpBuffer to avoid re-allocating PaintOpBuffers.

It will be useful for multithread chrome GPU experimental. It needs to
deserialize paint ops from command buffer, and store it in shared image.
This change allows reusing existing PaintOpBuffer.

Bug: None
Change-Id: I2f86b6c62f454495e591bbd841b8aa7156780e97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906938Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715042}