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This CL makes Cronet upload reuse a Java ByteBuffer object if the
underlying net::IOBuffer's address and buffer length are unchanged.

This should reduce the number of constructor calls to
NewDirectByteBuffer().

Bug: 756841
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester
Change-Id: I751242095e2ba5793750d5a91e2bc3b10ec8b7a1
Reviewed-on: https://chromium-review.googlesource.com/624196Reviewed-by: Andrei Kapishnikov <kapishnikov@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496067}