Mojo's network service should use a disk cache on Android
Mojo's network service should use a disk cache on Android

Launching Mojo apps on Android is slow because we keep the network cache in
memory, which means we lose it every time we launch MojoShell. After this CL,
we use a disk cache on Android. Note: We still use a memory cache on desktop
because we want to be able to run many instances of mojo_shell in parallel on
desktop for testing.

R=jamesr@chromium.org
BUG=452226

Review URL: https://codereview.chromium.org/883073003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#313642}

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