Non-SFI NaCl: Batch-open resource files

* Let the renderer pass URLs and manifest keys of the resource files
when it asks the browser to start a new plugin process.
* The browser opens all the URLs and passes file handlers to the
plugin process if the process is for non-SFI mode.
* Modify the non-SFI loader so that it can return a pre-opened
handle without doing a renderer IPC when open_resource IRT is
called.

This CL does not change the current behavior of SFI NaCl. SFI
NaCl support will be added in a separate CL:
https://codereview.chromium.org/728113002/

Note that this CL is primarily for ARC (App Runtime for Chrome)
which has 70+ DSO files. With this CL, the loading time of arc.nexe
gets ~40% shorter. This CL should not affect NaCl applications
other than ARC because most of them do not have that many DSO
files, and even if they have some, opening one DSO file in the
browser process takes only about 0.4ms (on Z620) which is usually
negligible.

TEST=PackagedAppTest.SuccessfulLoad
TEST=manually checked that SFI-NaCl and PNaCl are still working.
BUG=nativeclient:3802
BUG=348232

Review URL: https://codereview.chromium.org/649603004

Cr-Commit-Position: refs/heads/master@{#319931}

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