GitLab

Cherry-pick of chromium crrev.com/24082006

BUG: 10769152

Original description:

[Android WebView] Make InputStreamImpl::Read fill the IOBuffer.

This CL improves the performances of InputStreamImpl::Read. The
previous implementation was limiting each Read to transfer at most
4k. This CL makes it possible to fill, in a single run, the IOBuffer
up to the length provided by the caller.
In practice this will reduces the number of thread hops and IPCs.
Note: the max transfer size, at this point, is imited onlt by the
kMaxAllocationSize constant defined in async_resounrce_handler.cc.

Change-Id: I5c733b845641e98292d78400fefa749c02a8a0ef